R13: 00007ffdfc27e09f R14: 00007f4c642b19c0 R15: 000000000118bf2c tipc: Failed do clone local mcast rcv buffer ================================================================== BUG: KASAN: use-after-free in __skb_unlink include/linux/skbuff.h:2048 [inline] BUG: KASAN: use-after-free in __skb_dequeue include/linux/skbuff.h:2067 [inline] BUG: KASAN: use-after-free in __skb_queue_purge include/linux/skbuff.h:2778 [inline] BUG: KASAN: use-after-free in tipc_mcast_xmit+0x1026/0x16c0 net/tipc/bcast.c:421 Read of size 8 at addr ffff8881c7237b80 by task syz-executor.2/4687 CPU: 0 PID: 4687 Comm: syz-executor.2 Not tainted 5.4.71-syzkaller-00273-g0dd22903aee4 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1b0/0x21e lib/dump_stack.c:118 print_address_description+0x96/0x5d0 mm/kasan/report.c:374 __kasan_report+0x14b/0x1c0 mm/kasan/report.c:506 kasan_report+0x27/0x50 mm/kasan/common.c:634 __skb_unlink include/linux/skbuff.h:2048 [inline] __skb_dequeue include/linux/skbuff.h:2067 [inline] __skb_queue_purge include/linux/skbuff.h:2778 [inline] tipc_mcast_xmit+0x1026/0x16c0 net/tipc/bcast.c:421 tipc_sendmcast+0xc00/0xeb0 net/tipc/socket.c:830 __tipc_sendmsg+0x120d/0x2d30 net/tipc/socket.c:1368 tipc_sendmsg+0x51/0x70 net/tipc/socket.c:1301 sock_sendmsg_nosec net/socket.c:638 [inline] sock_sendmsg net/socket.c:658 [inline] kernel_sendmsg+0xe2/0x120 net/socket.c:678 sock_no_sendpage+0x13f/0x1b0 net/core/sock.c:2768 kernel_sendpage net/socket.c:3764 [inline] sock_sendpage+0xd0/0x120 net/socket.c:936 pipe_to_sendpage+0x23b/0x300 fs/splice.c:449 splice_from_pipe_feed fs/splice.c:500 [inline] __splice_from_pipe+0x2d3/0x870 fs/splice.c:624 splice_from_pipe fs/splice.c:659 [inline] generic_splice_sendpage+0x172/0x200 fs/splice.c:829 splice_direct_to_actor+0x496/0xb00 fs/splice.c:976 do_splice_direct+0x279/0x3d0 fs/splice.c:1064 do_sendfile+0x89d/0x1110 fs/read_write.c:1464 __do_sys_sendfile64 fs/read_write.c:1525 [inline] __se_sys_sendfile64 fs/read_write.c:1511 [inline] __x64_sys_sendfile64+0x1ae/0x220 fs/read_write.c:1511 do_syscall_64+0xcb/0x150 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45de59 Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f4c642b0c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 0000000000027ec0 RCX: 000000000045de59 RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000005 RBP: 00007f4c642b0ca0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000200fc0 R11: 0000000000000246 R12: 0000000000000027 R13: 00007ffdfc27e09f R14: 00007f4c642b19c0 R15: 000000000118bf2c Allocated by task 4687: save_stack mm/kasan/common.c:69 [inline] set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc+0x117/0x1b0 mm/kasan/common.c:510 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc_node mm/slub.c:2803 [inline] slab_alloc mm/slub.c:2811 [inline] kmem_cache_alloc+0x1d5/0x250 mm/slub.c:2816 kmem_cache_alloc_node include/linux/slab.h:427 [inline] __alloc_skb+0x88/0x4d0 net/core/skbuff.c:198 alloc_skb_fclone include/linux/skbuff.h:1107 [inline] tipc_buf_acquire net/tipc/msg.c:66 [inline] tipc_msg_build+0x74a/0x1b20 net/tipc/msg.c:368 tipc_sendmcast+0x92a/0xeb0 net/tipc/socket.c:824 __tipc_sendmsg+0x120d/0x2d30 net/tipc/socket.c:1368 tipc_sendmsg+0x51/0x70 net/tipc/socket.c:1301 sock_sendmsg_nosec net/socket.c:638 [inline] sock_sendmsg net/socket.c:658 [inline] kernel_sendmsg+0xe2/0x120 net/socket.c:678 sock_no_sendpage+0x13f/0x1b0 net/core/sock.c:2768 kernel_sendpage net/socket.c:3764 [inline] sock_sendpage+0xd0/0x120 net/socket.c:936 pipe_to_sendpage+0x23b/0x300 fs/splice.c:449 splice_from_pipe_feed fs/splice.c:500 [inline] __splice_from_pipe+0x2d3/0x870 fs/splice.c:624 splice_from_pipe fs/splice.c:659 [inline] generic_splice_sendpage+0x172/0x200 fs/splice.c:829 splice_direct_to_actor+0x496/0xb00 fs/splice.c:976 do_splice_direct+0x279/0x3d0 fs/splice.c:1064 do_sendfile+0x89d/0x1110 fs/read_write.c:1464 __do_sys_sendfile64 fs/read_write.c:1525 [inline] __se_sys_sendfile64 fs/read_write.c:1511 [inline] __x64_sys_sendfile64+0x1ae/0x220 fs/read_write.c:1511 do_syscall_64+0xcb/0x150 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 4687: save_stack mm/kasan/common.c:69 [inline] set_track mm/kasan/common.c:77 [inline] kasan_set_free_info mm/kasan/common.c:332 [inline] __kasan_slab_free+0x168/0x220 mm/kasan/common.c:471 slab_free_hook mm/slub.c:1453 [inline] slab_free_freelist_hook+0xd0/0x150 mm/slub.c:1486 slab_free mm/slub.c:3051 [inline] kmem_cache_free+0xac/0x5c0 mm/slub.c:3067 tipc_buf_append+0x2d1/0xad0 net/tipc/msg.c:188 tipc_msg_reassemble+0x331/0x590 net/tipc/msg.c:726 tipc_mcast_xmit+0x223/0x16c0 net/tipc/bcast.c:385 tipc_sendmcast+0xc00/0xeb0 net/tipc/socket.c:830 __tipc_sendmsg+0x120d/0x2d30 net/tipc/socket.c:1368 tipc_sendmsg+0x51/0x70 net/tipc/socket.c:1301 sock_sendmsg_nosec net/socket.c:638 [inline] sock_sendmsg net/socket.c:658 [inline] kernel_sendmsg+0xe2/0x120 net/socket.c:678 sock_no_sendpage+0x13f/0x1b0 net/core/sock.c:2768 kernel_sendpage net/socket.c:3764 [inline] sock_sendpage+0xd0/0x120 net/socket.c:936 pipe_to_sendpage+0x23b/0x300 fs/splice.c:449 splice_from_pipe_feed fs/splice.c:500 [inline] __splice_from_pipe+0x2d3/0x870 fs/splice.c:624 splice_from_pipe fs/splice.c:659 [inline] generic_splice_sendpage+0x172/0x200 fs/splice.c:829 splice_direct_to_actor+0x496/0xb00 fs/splice.c:976 do_splice_direct+0x279/0x3d0 fs/splice.c:1064 do_sendfile+0x89d/0x1110 fs/read_write.c:1464 __do_sys_sendfile64 fs/read_write.c:1525 [inline] __se_sys_sendfile64 fs/read_write.c:1511 [inline] __x64_sys_sendfile64+0x1ae/0x220 fs/read_write.c:1511 do_syscall_64+0xcb/0x150 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff8881c7237b80 which belongs to the cache skbuff_fclone_cache of size 488 The buggy address is located 0 bytes inside of 488-byte region [ffff8881c7237b80, ffff8881c7237d68) The buggy address belongs to the page: page:ffffea00071c8d80 refcount:1 mapcount:0 mapping:ffff8881daa93b80 index:0x0 compound_mapcount: 0 flags: 0x8000000000010200(slab|head) raw: 8000000000010200 ffffea0007281500 0000000400000004 ffff8881daa93b80 raw: 0000000000000000 00000000800c000c 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881c7237a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc ffff8881c7237b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8881c7237b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881c7237c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881c7237c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ================================================================== BUG: KASAN: double-free or invalid-free in slab_free mm/slub.c:3051 [inline] BUG: KASAN: double-free or invalid-free in kmem_cache_free+0xac/0x5c0 mm/slub.c:3067 CPU: 0 PID: 4687 Comm: syz-executor.2 Tainted: G B 5.4.71-syzkaller-00273-g0dd22903aee4 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1b0/0x21e lib/dump_stack.c:118 print_address_description+0x96/0x5d0 mm/kasan/report.c:374 kasan_report_invalid_free+0x54/0xc0 mm/kasan/report.c:468 __kasan_slab_free+0x102/0x220 mm/kasan/common.c:459 slab_free_hook mm/slub.c:1453 [inline] slab_free_freelist_hook+0xd0/0x150 mm/slub.c:1486 slab_free mm/slub.c:3051 [inline] kmem_cache_free+0xac/0x5c0 mm/slub.c:3067 __skb_queue_purge include/linux/skbuff.h:2779 [inline] tipc_mcast_xmit+0x10a8/0x16c0 net/tipc/bcast.c:421 tipc_sendmcast+0xc00/0xeb0 net/tipc/socket.c:830 __tipc_sendmsg+0x120d/0x2d30 net/tipc/socket.c:1368 tipc_sendmsg+0x51/0x70 net/tipc/socket.c:1301 sock_sendmsg_nosec net/socket.c:638 [inline] sock_sendmsg net/socket.c:658 [inline] kernel_sendmsg+0xe2/0x120 net/socket.c:678 sock_no_sendpage+0x13f/0x1b0 net/core/sock.c:2768 kernel_sendpage net/socket.c:3764 [inline] sock_sendpage+0xd0/0x120 net/socket.c:936 pipe_to_sendpage+0x23b/0x300 fs/splice.c:449 splice_from_pipe_feed fs/splice.c:500 [inline] __splice_from_pipe+0x2d3/0x870 fs/splice.c:624 splice_from_pipe fs/splice.c:659 [inline] generic_splice_sendpage+0x172/0x200 fs/splice.c:829 splice_direct_to_actor+0x496/0xb00 fs/splice.c:976 do_splice_direct+0x279/0x3d0 fs/splice.c:1064 do_sendfile+0x89d/0x1110 fs/read_write.c:1464 __do_sys_sendfile64 fs/read_write.c:1525 [inline] __se_sys_sendfile64 fs/read_write.c:1511 [inline] __x64_sys_sendfile64+0x1ae/0x220 fs/read_write.c:1511 do_syscall_64+0xcb/0x150 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45de59 Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f4c642b0c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 0000000000027ec0 RCX: 000000000045de59 RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000005 RBP: 00007f4c642b0ca0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000200fc0 R11: 0000000000000246 R12: 0000000000000027 R13: 00007ffdfc27e09f R14: 00007f4c642b19c0 R15: 000000000118bf2c Allocated by task 330: save_stack mm/kasan/common.c:69 [inline] set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc+0x117/0x1b0 mm/kasan/common.c:510 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc_node mm/slub.c:2803 [inline] slab_alloc mm/slub.c:2811 [inline] kmem_cache_alloc+0x1d5/0x250 mm/slub.c:2816 kmem_cache_alloc_node include/linux/slab.h:427 [inline] __alloc_skb+0x88/0x4d0 net/core/skbuff.c:198 alloc_skb_fclone include/linux/skbuff.h:1107 [inline] sk_stream_alloc_skb+0x418/0xa60 net/ipv4/tcp.c:885 tcp_sendmsg_locked+0xe5b/0x3de0 net/ipv4/tcp.c:1293 tcp_sendmsg+0x2c/0x40 net/ipv4/tcp.c:1443 sock_sendmsg_nosec net/socket.c:638 [inline] sock_sendmsg net/socket.c:658 [inline] sock_write_iter+0x352/0x4a0 net/socket.c:990 call_write_iter include/linux/fs.h:1958 [inline] new_sync_write fs/read_write.c:483 [inline] __vfs_write+0x579/0x700 fs/read_write.c:496 vfs_write+0x217/0x4f0 fs/read_write.c:558 ksys_write+0x168/0x2a0 fs/read_write.c:611 do_syscall_64+0xcb/0x150 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 4687: save_stack mm/kasan/common.c:69 [inline] set_track mm/kasan/common.c:77 [inline] kasan_set_free_info mm/kasan/common.c:332 [inline] __kasan_slab_free+0x168/0x220 mm/kasan/common.c:471 slab_free_hook mm/slub.c:1453 [inline] slab_free_freelist_hook+0xd0/0x150 mm/slub.c:1486 slab_free mm/slub.c:3051 [inline] kmem_cache_free+0xac/0x5c0 mm/slub.c:3067 tcp_rtx_queue_unlink_and_free include/net/tcp.h:1828 [inline] tcp_clean_rtx_queue net/ipv4/tcp_input.c:3172 [inline] tcp_ack+0x2140/0x6730 net/ipv4/tcp_input.c:3709 tcp_rcv_established+0xe5b/0x21d0 net/ipv4/tcp_input.c:5653 tcp_v4_do_rcv+0x398/0x750 net/ipv4/tcp_ipv4.c:1573 tcp_v4_rcv+0x342c/0x4620 net/ipv4/tcp_ipv4.c:1954 ip_protocol_deliver_rcu+0x2bd/0x620 net/ipv4/ip_input.c:204 ip_local_deliver_finish net/ipv4/ip_input.c:231 [inline] NF_HOOK include/linux/netfilter.h:305 [inline] ip_local_deliver+0x44e/0x5e0 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:450 [inline] ip_sublist_rcv_finish net/ipv4/ip_input.c:534 [inline] ip_list_rcv_finish net/ipv4/ip_input.c:572 [inline] ip_sublist_rcv+0x6e6/0x750 net/ipv4/ip_input.c:580 ip_list_rcv+0x4a4/0x4f0 net/ipv4/ip_input.c:614 __netif_receive_skb_list_ptype net/core/dev.c:4971 [inline] __netif_receive_skb_list_core+0x6f7/0x920 net/core/dev.c:5019 __netif_receive_skb_list+0x50c/0x5e0 net/core/dev.c:5071 netif_receive_skb_list_internal+0x465/0x720 net/core/dev.c:5166 gro_normal_list net/core/dev.c:5277 [inline] napi_complete_done+0x21f/0x6c0 net/core/dev.c:5999 virtqueue_napi_complete+0x28/0x90 drivers/net/virtio_net.c:334 virtnet_poll+0xab2/0xe30 drivers/net/virtio_net.c:1439 napi_poll+0x183/0x640 net/core/dev.c:6314 net_rx_action+0x367/0x980 net/core/dev.c:6382 __do_softirq+0x22e/0x569 kernel/softirq.c:292 The buggy address belongs to the object at ffff88817db2cf00 which belongs to the cache skbuff_fclone_cache of size 488 The buggy address is located 0 bytes inside of 488-byte region [ffff88817db2cf00, ffff88817db2d0e8) The buggy address belongs to the page: page:ffffea0005f6cb00 refcount:1 mapcount:0 mapping:ffff8881daa93b80 index:0x0 compound_mapcount: 0 flags: 0x8000000000010200(slab|head) raw: 8000000000010200 ffffea00073fc900 0000000700000007 ffff8881daa93b80 raw: 0000000000000000 00000000800c000c 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88817db2ce00: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc ffff88817db2ce80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88817db2cf00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88817db2cf80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88817db2d000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ================================================================== BUG: KASAN: double-free or invalid-free in slab_free mm/slub.c:3051 [inline] BUG: KASAN: double-free or invalid-free in kmem_cache_free+0xac/0x5c0 mm/slub.c:3067 CPU: 0 PID: 4687 Comm: syz-executor.2 Tainted: G B 5.4.71-syzkaller-00273-g0dd22903aee4 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1b0/0x21e lib/dump_stack.c:118 print_address_description+0x96/0x5d0 mm/kasan/report.c:374 kasan_report_invalid_free+0x54/0xc0 mm/kasan/report.c:468 __kasan_slab_free+0x102/0x220 mm/kasan/common.c:459 slab_free_hook mm/slub.c:1453 [inline] slab_free_freelist_hook+0xd0/0x150 mm/slub.c:1486 slab_free mm/slub.c:3051 [inline] kmem_cache_free+0xac/0x5c0 mm/slub.c:3067 __skb_queue_purge include/linux/skbuff.h:2779 [inline] tipc_mcast_xmit+0x10a8/0x16c0 net/tipc/bcast.c:421 tipc_sendmcast+0xc00/0xeb0 net/tipc/socket.c:830 __tipc_sendmsg+0x120d/0x2d30 net/tipc/socket.c:1368 tipc_sendmsg+0x51/0x70 net/tipc/socket.c:1301 sock_sendmsg_nosec net/socket.c:638 [inline] sock_sendmsg net/socket.c:658 [inline] kernel_sendmsg+0xe2/0x120 net/socket.c:678 sock_no_sendpage+0x13f/0x1b0 net/core/sock.c:2768 kernel_sendpage net/socket.c:3764 [inline] sock_sendpage+0xd0/0x120 net/socket.c:936 pipe_to_sendpage+0x23b/0x300 fs/splice.c:449 splice_from_pipe_feed fs/splice.c:500 [inline] __splice_from_pipe+0x2d3/0x870 fs/splice.c:624 splice_from_pipe fs/splice.c:659 [inline] generic_splice_sendpage+0x172/0x200 fs/splice.c:829 splice_direct_to_actor+0x496/0xb00 fs/splice.c:976 do_splice_direct+0x279/0x3d0 fs/splice.c:1064 do_sendfile+0x89d/0x1110 fs/read_write.c:1464 __do_sys_sendfile64 fs/read_write.c:1525 [inline] __se_sys_sendfile64 fs/read_write.c:1511 [inline] __x64_sys_sendfile64+0x1ae/0x220 fs/read_write.c:1511 do_syscall_64+0xcb/0x150 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45de59 Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f4c642b0c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 0000000000027ec0 RCX: 000000000045de59 RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000005 RBP: 00007f4c642b0ca0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000200fc0 R11: 0000000000000246 R12: 0000000000000027 R13: 00007ffdfc27e09f R14: 00007f4c642b19c0 R15: 000000000118bf2c Allocated by task 4687: save_stack mm/kasan/common.c:69 [inline] set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc+0x117/0x1b0 mm/kasan/common.c:510 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc_node mm/slub.c:2803 [inline] slab_alloc mm/slub.c:2811 [inline] kmem_cache_alloc+0x1d5/0x250 mm/slub.c:2816 __build_skb net/core/skbuff.c:311 [inline] __napi_alloc_skb+0xd6/0x520 net/core/skbuff.c:524 napi_alloc_skb include/linux/skbuff.h:2850 [inline] page_to_skb+0x3e/0x820 drivers/net/virtio_net.c:389 receive_mergeable+0x871/0x2820 drivers/net/virtio_net.c:929 receive_buf+0x151/0x15c0 drivers/net/virtio_net.c:1038 virtnet_receive drivers/net/virtio_net.c:1330 [inline] virtnet_poll+0x57b/0xe30 drivers/net/virtio_net.c:1435 napi_poll+0x183/0x640 net/core/dev.c:6314 net_rx_action+0x367/0x980 net/core/dev.c:6382 __do_softirq+0x22e/0x569 kernel/softirq.c:292 Freed by task 4687: save_stack mm/kasan/common.c:69 [inline] set_track mm/kasan/common.c:77 [inline] kasan_set_free_info mm/kasan/common.c:332 [inline] __kasan_slab_free+0x168/0x220 mm/kasan/common.c:471 slab_free_hook mm/slub.c:1453 [inline] slab_free_freelist_hook+0xd0/0x150 mm/slub.c:1486 slab_free mm/slub.c:3051 [inline] kmem_cache_free+0xac/0x5c0 mm/slub.c:3067 tcp_rcv_established+0xe63/0x21d0 net/ipv4/tcp_input.c:5654 tcp_v4_do_rcv+0x398/0x750 net/ipv4/tcp_ipv4.c:1573 tcp_v4_rcv+0x342c/0x4620 net/ipv4/tcp_ipv4.c:1954 ip_protocol_deliver_rcu+0x2bd/0x620 net/ipv4/ip_input.c:204 ip_local_deliver_finish net/ipv4/ip_input.c:231 [inline] NF_HOOK include/linux/netfilter.h:305 [inline] ip_local_deliver+0x44e/0x5e0 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:450 [inline] ip_sublist_rcv_finish net/ipv4/ip_input.c:534 [inline] ip_list_rcv_finish net/ipv4/ip_input.c:572 [inline] ip_sublist_rcv+0x6e6/0x750 net/ipv4/ip_input.c:580 ip_list_rcv+0x4a4/0x4f0 net/ipv4/ip_input.c:614 __netif_receive_skb_list_ptype net/core/dev.c:4971 [inline] __netif_receive_skb_list_core+0x6f7/0x920 net/core/dev.c:5019 __netif_receive_skb_list+0x50c/0x5e0 net/core/dev.c:5071 netif_receive_skb_list_internal+0x465/0x720 net/core/dev.c:5166 gro_normal_list net/core/dev.c:5277 [inline] napi_complete_done+0x21f/0x6c0 net/core/dev.c:5999 virtqueue_napi_complete+0x28/0x90 drivers/net/virtio_net.c:334 virtnet_poll+0xab2/0xe30 drivers/net/virtio_net.c:1439 napi_poll+0x183/0x640 net/core/dev.c:6314 net_rx_action+0x367/0x980 net/core/dev.c:6382 __do_softirq+0x22e/0x569 kernel/softirq.c:292 The buggy address belongs to the object at ffff8881cb823640 which belongs to the cache skbuff_head_cache of size 240 The buggy address is located 0 bytes inside of 240-byte region [ffff8881cb823640, ffff8881cb823730) The buggy address belongs to the page: page:ffffea00072e08c0 refcount:1 mapcount:0 mapping:ffff8881daa93180 index:0x0 flags: 0x8000000000000200(slab) raw: 8000000000000200 ffffea0005fdfec0 0000000400000004 ffff8881daa93180 raw: 0000000000000000 00000000000c000c 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881cb823500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881cb823580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc >ffff8881cb823600: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ^ ffff8881cb823680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881cb823700: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc ================================================================== kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#2] PREEMPT SMP KASAN CPU: 1 PID: 4687 Comm: syz-executor.2 Tainted: G B D 5.4.71-syzkaller-00273-g0dd22903aee4 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:arch_atomic_add_return arch/x86/include/asm/atomic.h:167 [inline] RIP: 0010:arch_atomic_sub_return arch/x86/include/asm/atomic.h:179 [inline] RIP: 0010:atomic_sub_return include/asm-generic/atomic-instrumented.h:160 [inline] RIP: 0010:atomic_dec_return include/linux/atomic-fallback.h:455 [inline] RIP: 0010:dst_release+0x24/0xe0 net/core/dst.c:174 Code: ff ff 0f 1f 40 00 55 41 56 53 49 89 fe e8 c4 9e 15 fe 4d 85 f6 74 3b 49 8d 7e 40 be 04 00 00 00 e8 d1 2e 43 fe bb ff ff ff ff 41 0f c1 5e 40 8d 73 ff 31 ff e8 3c a2 15 fe ff cb 78 1e 31 ff RSP: 0018:ffff88819cb56e80 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 00000000ffffffff RCX: ffffffff832bc94f RDX: 0000000000000001 RSI: 0000000000000004 RDI: c3c000c5000001a8 RBP: ffff88819cb570d0 R08: ffffffff83215607 R09: ffffed1039de621d R10: ffffed1039de621d R11: 0000000000000000 R12: dffffc0000000000 R13: 1ffff11039de620b R14: c3c000c500000168 R15: ffff8881cef31058 FS: 00007f4c642b1700(0000) GS:ffff8881db900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0e768bb008 CR3: 000000019d3f7002 CR4: 00000000001606e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: refdst_drop include/net/dst.h:259 [inline] skb_dst_drop include/net/dst.h:271 [inline] skb_release_head_state+0x71/0x210 net/core/skbuff.c:650 skb_release_all net/core/skbuff.c:664 [inline] __kfree_skb+0x21/0x180 net/core/skbuff.c:680 __skb_queue_purge include/linux/skbuff.h:2779 [inline] tipc_mcast_xmit+0x10a8/0x16c0 net/tipc/bcast.c:421 tipc_sendmcast+0xc00/0xeb0 net/tipc/socket.c:830 __tipc_sendmsg+0x120d/0x2d30 net/tipc/socket.c:1368 tipc_sendmsg+0x51/0x70 net/tipc/socket.c:1301 sock_sendmsg_nosec net/socket.c:638 [inline] sock_sendmsg net/socket.c:658 [inline] kernel_sendmsg+0xe2/0x120 net/socket.c:678 sock_no_sendpage+0x13f/0x1b0 net/core/sock.c:2768 kernel_sendpage net/socket.c:3764 [inline] sock_sendpage+0xd0/0x120 net/socket.c:936 pipe_to_sendpage+0x23b/0x300 fs/splice.c:449 splice_from_pipe_feed fs/splice.c:500 [inline] __splice_from_pipe+0x2d3/0x870 fs/splice.c:624 splice_from_pipe fs/splice.c:659 [inline] generic_splice_sendpage+0x172/0x200 fs/splice.c:829 splice_direct_to_actor+0x496/0xb00 fs/splice.c:976 do_splice_direct+0x279/0x3d0 fs/splice.c:1064 do_sendfile+0x89d/0x1110 fs/read_write.c:1464 __do_sys_sendfile64 fs/read_write.c:1525 [inline] __se_sys_sendfile64 fs/read_write.c:1511 [inline] __x64_sys_sendfile64+0x1ae/0x220 fs/read_write.c:1511 do_syscall_64+0xcb/0x150 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45de59 Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f4c642b0c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 0000000000027ec0 RCX: 000000000045de59 RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000005 RBP: 00007f4c642b0ca0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000200fc0 R11: 0000000000000246 R12: 0000000000000027 R13: 00007ffdfc27e09f R14: 00007f4c642b19c0 R15: 000000000118bf2c Modules linked in: