================================================================== BUG: KASAN: slab-out-of-bounds in __read_once_size include/linux/compiler.h:199 [inline] BUG: KASAN: slab-out-of-bounds in sock_cgroup_ptr include/linux/cgroup.h:836 [inline] BUG: KASAN: slab-out-of-bounds in inet_diag_bc_sk+0xb64/0xc70 net/ipv4/inet_diag.c:749 Read of size 8 at addr ffff88808dd6d260 by task syz-executor.2/30220 CPU: 1 PID: 30220 Comm: syz-executor.2 Not tainted 5.7.0-rc2-syzkaller #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+0x188/0x20d lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xd3/0x315 mm/kasan/report.c:382 __kasan_report.cold+0x35/0x4d mm/kasan/report.c:511 kasan_report+0x33/0x50 mm/kasan/common.c:625 __read_once_size include/linux/compiler.h:199 [inline] sock_cgroup_ptr include/linux/cgroup.h:836 [inline] inet_diag_bc_sk+0xb64/0xc70 net/ipv4/inet_diag.c:749 inet_diag_dump_icsk+0xbe4/0x1306 net/ipv4/inet_diag.c:1061 __inet_diag_dump+0x8d/0x240 net/ipv4/inet_diag.c:1113 netlink_dump+0x50b/0xf50 net/netlink/af_netlink.c:2245 __netlink_dump_start+0x63f/0x910 net/netlink/af_netlink.c:2353 netlink_dump_start include/linux/netlink.h:246 [inline] inet_diag_handler_cmd+0x263/0x2c0 net/ipv4/inet_diag.c:1278 __sock_diag_cmd net/core/sock_diag.c:233 [inline] sock_diag_rcv_msg+0x2fe/0x3e0 net/core/sock_diag.c:264 netlink_rcv_skb+0x15a/0x410 net/netlink/af_netlink.c:2469 sock_diag_rcv+0x26/0x40 net/core/sock_diag.c:275 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x537/0x740 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x882/0xe10 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 sock_write_iter+0x289/0x3c0 net/socket.c:1004 call_write_iter include/linux/fs.h:1907 [inline] do_iter_readv_writev+0x5a8/0x850 fs/read_write.c:694 do_iter_write fs/read_write.c:999 [inline] do_iter_write+0x18b/0x600 fs/read_write.c:980 vfs_writev+0x1b3/0x2f0 fs/read_write.c:1072 do_writev+0x27f/0x300 fs/read_write.c:1115 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45c829 Code: 0d b7 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 b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f416aa6dc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 000000000050d140 RCX: 000000000045c829 RDX: 0000000000000001 RSI: 00000000200000c0 RDI: 0000000000000005 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000d18 R14: 00000000004cb1f4 R15: 00007f416aa6e6d4 Allocated by task 23585: save_stack+0x1b/0x40 mm/kasan/common.c:49 set_track mm/kasan/common.c:57 [inline] __kasan_kmalloc mm/kasan/common.c:495 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:468 slab_post_alloc_hook mm/slab.h:586 [inline] slab_alloc mm/slab.c:3320 [inline] kmem_cache_alloc+0x11b/0x740 mm/slab.c:3484 dst_alloc+0x103/0x1c0 net/core/dst.c:93 ip6_dst_alloc+0x2e/0x90 net/ipv6/route.c:355 icmp6_dst_alloc+0x69/0x460 net/ipv6/route.c:3135 ndisc_send_skb+0xfd8/0x14b0 net/ipv6/ndisc.c:486 ndisc_send_ns+0x3b0/0x860 net/ipv6/ndisc.c:648 ndisc_solicit+0x2ed/0x470 net/ipv6/ndisc.c:740 neigh_probe+0xcc/0x110 net/core/neighbour.c:1009 __neigh_event_send+0x3d4/0x16d0 net/core/neighbour.c:1170 neigh_event_send include/net/neighbour.h:444 [inline] neigh_resolve_output+0x590/0x930 net/core/neighbour.c:1473 neigh_output include/net/neighbour.h:510 [inline] ip6_finish_output2+0x1091/0x25b0 net/ipv6/ip6_output.c:117 __ip6_finish_output+0x442/0xab0 net/ipv6/ip6_output.c:143 ip6_finish_output+0x34/0x1f0 net/ipv6/ip6_output.c:153 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip6_output+0x239/0x810 net/ipv6/ip6_output.c:176 dst_output include/net/dst.h:435 [inline] NF_HOOK include/linux/netfilter.h:307 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ip6_xmit+0xe1a/0x2090 net/ipv6/ip6_output.c:280 tcp_v6_send_synack+0x4e7/0x960 net/ipv6/tcp_ipv6.c:521 tcp_conn_request+0x256c/0x34e0 net/ipv4/tcp_input.c:6748 tcp_v6_conn_request net/ipv6/tcp_ipv6.c:1151 [inline] tcp_v6_conn_request+0x100/0x2b0 net/ipv6/tcp_ipv6.c:1143 tcp_rcv_state_process+0xa19/0x4c89 net/ipv4/tcp_input.c:6219 tcp_v6_do_rcv+0x7d2/0x1290 net/ipv6/tcp_ipv6.c:1463 tcp_v6_rcv+0x2e66/0x3640 net/ipv6/tcp_ipv6.c:1659 ip6_protocol_deliver_rcu+0x2e6/0x1660 net/ipv6/ip6_input.c:433 ip6_input_finish+0x7f/0x160 net/ipv6/ip6_input.c:474 NF_HOOK include/linux/netfilter.h:307 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ip6_input+0xcf/0x3d0 net/ipv6/ip6_input.c:483 dst_input include/net/dst.h:441 [inline] ip6_rcv_finish+0x1d9/0x310 net/ipv6/ip6_input.c:76 NF_HOOK include/linux/netfilter.h:307 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ipv6_rcv+0xf8/0x3f0 net/ipv6/ip6_input.c:307 __netif_receive_skb_one_core+0xf5/0x160 net/core/dev.c:5188 __netif_receive_skb+0x27/0x1c0 net/core/dev.c:5302 netif_receive_skb_internal net/core/dev.c:5392 [inline] netif_receive_skb+0x16e/0x960 net/core/dev.c:5451 tun_rx_batched.isra.0+0x47b/0x7d0 drivers/net/tun.c:1516 tun_get_user+0x13c6/0x3c70 drivers/net/tun.c:1963 tun_chr_write_iter+0xba/0x151 drivers/net/tun.c:1992 call_write_iter include/linux/fs.h:1907 [inline] new_sync_write+0x4a2/0x700 fs/read_write.c:484 __vfs_write+0xc9/0x100 fs/read_write.c:497 vfs_write+0x268/0x5d0 fs/read_write.c:559 ksys_write+0x12d/0x250 fs/read_write.c:612 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 Freed by task 23584: save_stack+0x1b/0x40 mm/kasan/common.c:49 set_track mm/kasan/common.c:57 [inline] kasan_set_free_info mm/kasan/common.c:317 [inline] __kasan_slab_free+0xf7/0x140 mm/kasan/common.c:456 __cache_free mm/slab.c:3426 [inline] kmem_cache_free+0x7f/0x320 mm/slab.c:3694 dst_destroy+0x27f/0x3a0 net/core/dst.c:129 rcu_do_batch kernel/rcu/tree.c:2206 [inline] rcu_core+0x59f/0x1370 kernel/rcu/tree.c:2433 __do_softirq+0x26c/0x9f7 kernel/softirq.c:292 The buggy address belongs to the object at ffff88808dd6d180 which belongs to the cache ip6_dst_cache of size 224 The buggy address is located 0 bytes to the right of 224-byte region [ffff88808dd6d180, ffff88808dd6d260) The buggy address belongs to the page: page:ffffea0002375b40 refcount:1 mapcount:0 mapping:00000000283cc5ec index:0xffff88808dd6d680 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea0002919e08 ffffea0002a17288 ffff888215072380 raw: ffff88808dd6d680 ffff88808dd6d040 0000000100000003 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88808dd6d100: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc ffff88808dd6d180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88808dd6d200: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff88808dd6d280: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ffff88808dd6d300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================