================================================================== BUG: KASAN: use-after-free in instrument_atomic_read include/linux/instrumented.h:71 [inline] BUG: KASAN: use-after-free in atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline] BUG: KASAN: use-after-free in refcount_read include/linux/refcount.h:147 [inline] BUG: KASAN: use-after-free in skb_unref include/linux/skbuff.h:1076 [inline] BUG: KASAN: use-after-free in consume_skb+0x27/0x110 net/core/skbuff.c:908 Read of size 4 at addr ffff88802437bd5c by task syz-executor.2/20597 CPU: 0 PID: 20597 Comm: syz-executor.2 Not tainted 5.15.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1dc/0x2d8 lib/dump_stack.c:106 print_address_description+0x65/0x380 mm/kasan/report.c:247 __kasan_report mm/kasan/report.c:433 [inline] kasan_report+0x19a/0x1f0 mm/kasan/report.c:450 kasan_check_range+0x2b5/0x2f0 mm/kasan/generic.c:189 instrument_atomic_read include/linux/instrumented.h:71 [inline] atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline] refcount_read include/linux/refcount.h:147 [inline] skb_unref include/linux/skbuff.h:1076 [inline] consume_skb+0x27/0x110 net/core/skbuff.c:908 __sk_msg_free+0x788/0x820 net/core/skmsg.c:196 sk_msg_free net/core/skmsg.c:209 [inline] __sk_psock_purge_ingress_msg net/core/skmsg.c:748 [inline] __sk_psock_zap_ingress net/core/skmsg.c:766 [inline] sk_psock_stop+0x3f5/0x4a0 net/core/skmsg.c:784 sock_map_close+0x4a5/0x720 net/core/sock_map.c:1510 unix_release+0x7e/0xc0 net/unix/af_unix.c:948 __sock_release net/socket.c:649 [inline] sock_close+0xd8/0x260 net/socket.c:1314 __fput+0x3fc/0x870 fs/file_table.c:280 task_work_run+0x146/0x1c0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x209/0x220 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x2e/0x70 kernel/entry/common.c:300 do_syscall_64+0x53/0xd0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fa6688b372b Code: 0f 05 48 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 63 fc ff ff 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 a1 fc ff ff 8b 44 RSP: 002b:00007ffcdaa260f0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000006 RCX: 00007fa6688b372b RDX: 0000000000000000 RSI: ffffffff817a6496 RDI: 0000000000000005 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000001b2c222df8 R10: 0000000000000613 R11: 0000000000000293 R12: 00007fa668a14b60 R13: 00007fa668a14b60 R14: 00007fa668a13f60 R15: 0000000000071944 Allocated by task 20601: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] __kasan_slab_alloc+0xb6/0xf0 mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:259 [inline] slab_post_alloc_hook mm/slab.h:519 [inline] slab_alloc_node mm/slub.c:3234 [inline] slab_alloc mm/slub.c:3242 [inline] kmem_cache_alloc+0x1c9/0x310 mm/slub.c:3247 skb_clone+0x1b4/0x360 net/core/skbuff.c:1521 sk_psock_verdict_recv+0x68/0x640 net/core/skmsg.c:1157 unix_read_sock+0x130/0x370 net/unix/af_unix.c:2420 sk_psock_verdict_data_ready+0x166/0x1e0 net/core/skmsg.c:1200 unix_dgram_sendmsg+0x19cc/0x2a50 net/unix/af_unix.c:1941 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg net/socket.c:724 [inline] ____sys_sendmsg+0x5b9/0x910 net/socket.c:2409 ___sys_sendmsg net/socket.c:2463 [inline] __sys_sendmmsg+0x3ba/0x750 net/socket.c:2549 __do_sys_sendmmsg net/socket.c:2578 [inline] __se_sys_sendmmsg net/socket.c:2575 [inline] __x64_sys_sendmmsg+0x9c/0xb0 net/socket.c:2575 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 7: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:46 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x10d/0x150 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:1723 [inline] slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1749 slab_free mm/slub.c:3513 [inline] kmem_cache_free+0x95/0x190 mm/slub.c:3529 sock_drop include/linux/skmsg.h:310 [inline] sk_psock_backlog+0xf98/0x1130 net/core/skmsg.c:668 process_one_work+0x853/0x1140 kernel/workqueue.c:2298 worker_thread+0xac1/0x1320 kernel/workqueue.c:2445 kthread+0x468/0x490 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 The buggy address belongs to the object at ffff88802437bc80 which belongs to the cache skbuff_head_cache of size 232 The buggy address is located 220 bytes inside of 232-byte region [ffff88802437bc80, ffff88802437bd68) The buggy address belongs to the page: page:ffffea000090dec0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2437b flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 0000000000000000 dead000000000001 ffff888140736640 raw: 0000000000000000 00000000000c000c 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY), pid 6505, ts 101384558664, free_ts 101307986168 prep_new_page mm/page_alloc.c:2418 [inline] get_page_from_freelist+0x729/0x9e0 mm/page_alloc.c:4149 __alloc_pages+0x255/0x580 mm/page_alloc.c:5369 alloc_slab_page mm/slub.c:1793 [inline] allocate_slab+0xcc/0x4d0 mm/slub.c:1930 new_slab mm/slub.c:1993 [inline] ___slab_alloc+0x41e/0xc40 mm/slub.c:3022 __slab_alloc mm/slub.c:3109 [inline] slab_alloc_node mm/slub.c:3200 [inline] slab_alloc mm/slub.c:3242 [inline] kmem_cache_alloc+0x276/0x310 mm/slub.c:3247 __build_skb+0x25/0x2f0 net/core/skbuff.c:239 build_skb+0x1f/0x170 net/core/skbuff.c:256 page_to_skb+0x138/0xcc0 drivers/net/virtio_net.c:423 receive_mergeable+0x310/0x3b10 drivers/net/virtio_net.c:1042 receive_buf+0x158/0x1dc0 drivers/net/virtio_net.c:1152 virtnet_receive drivers/net/virtio_net.c:1444 [inline] virtnet_poll+0x5ed/0x11c0 drivers/net/virtio_net.c:1553 __napi_poll+0xbd/0x520 net/core/dev.c:7020 napi_poll net/core/dev.c:7087 [inline] net_rx_action+0x61c/0xf30 net/core/dev.c:7174 __do_softirq+0x392/0x7a3 kernel/softirq.c:558 __irq_exit_rcu+0xec/0x170 kernel/softirq.c:636 irq_exit_rcu+0x5/0x20 kernel/softirq.c:648 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1338 [inline] free_pcp_prepare+0xd1c/0xe00 mm/page_alloc.c:1389 free_unref_page_prepare mm/page_alloc.c:3309 [inline] free_unref_page+0x7d/0x580 mm/page_alloc.c:3388 free_slab mm/slub.c:2033 [inline] discard_slab mm/slub.c:2039 [inline] __unfreeze_partials+0x1ab/0x200 mm/slub.c:2527 put_cpu_partial+0x116/0x180 mm/slub.c:2603 do_slab_free mm/slub.c:3501 [inline] ___cache_free+0xe6/0x120 mm/slub.c:3520 qlist_free_all mm/kasan/quarantine.c:165 [inline] kasan_quarantine_reduce+0x151/0x1c0 mm/kasan/quarantine.c:272 __kasan_slab_alloc+0x2f/0xf0 mm/kasan/common.c:444 kasan_slab_alloc include/linux/kasan.h:259 [inline] slab_post_alloc_hook mm/slab.h:519 [inline] slab_alloc_node mm/slub.c:3234 [inline] kmem_cache_alloc_node+0x201/0x370 mm/slub.c:3270 __alloc_skb+0xd8/0x5a0 net/core/skbuff.c:414 alloc_skb_fclone include/linux/skbuff.h:1176 [inline] tcp_stream_alloc_skb+0x67/0x850 net/ipv4/tcp.c:861 tcp_sendmsg_locked+0xdb7/0x48a0 net/ipv4/tcp.c:1281 tcp_sendmsg+0x2c/0x40 net/ipv4/tcp.c:1440 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg net/socket.c:724 [inline] sock_write_iter+0x37c/0x4e0 net/socket.c:1057 call_write_iter include/linux/fs.h:2162 [inline] new_sync_write fs/read_write.c:503 [inline] vfs_write+0xb11/0xe90 fs/read_write.c:590 ksys_write+0x18f/0x2c0 fs/read_write.c:643 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 Memory state around the buggy address: ffff88802437bc00: fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc ffff88802437bc80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88802437bd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc ^ ffff88802437bd80: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ffff88802437be00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================