bond0: Enslaving bond_slave as an active interface with an up link IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready team0: Port device team_slave added IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready ================================================================== BUG: KASAN: use-after-free in atomic_sub_return include/asm-generic/atomic-instrumented.h:258 [inline] BUG: KASAN: use-after-free in skb_release_data+0x19b/0x860 net/core/skbuff.c:559 Write of size 4 at addr ffff8801d8f90ae0 by task syzkaller756769/4502 CPU: 0 PID: 4502 Comm: syzkaller756769 Not tainted 4.16.0+ #19 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+0x1b9/0x294 lib/dump_stack.c:113 print_address_description+0x6c/0x20b mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0xac/0x2f5 mm/kasan/report.c:412 check_memory_region_inline mm/kasan/kasan.c:260 [inline] check_memory_region+0x13e/0x1b0 mm/kasan/kasan.c:267 kasan_check_write+0x14/0x20 mm/kasan/kasan.c:278 atomic_sub_return include/asm-generic/atomic-instrumented.h:258 [inline] skb_release_data+0x19b/0x860 net/core/skbuff.c:559 skb_release_all+0x4a/0x60 net/core/skbuff.c:627 __kfree_skb net/core/skbuff.c:641 [inline] kfree_skb+0x195/0x560 net/core/skbuff.c:659 skb_queue_purge+0x19/0x40 net/core/skbuff.c:2838 packet_sock_destruct+0x93/0x290 net/packet/af_packet.c:1308 __sk_destruct+0xff/0xa40 net/core/sock.c:1566 sk_destruct+0x78/0x90 net/core/sock.c:1601 __sk_free+0x22e/0x340 net/core/sock.c:1612 sk_free+0x42/0x50 net/core/sock.c:1623 sock_put include/net/sock.h:1664 [inline] packet_release+0xa18/0xd50 net/packet/af_packet.c:3042 sock_release+0x96/0x1b0 net/socket.c:594 sock_close+0x16/0x20 net/socket.c:1149 __fput+0x34d/0x890 fs/file_table.c:209 ____fput+0x15/0x20 fs/file_table.c:243 task_work_run+0x1e4/0x290 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x1aee/0x2730 kernel/exit.c:865 do_group_exit+0x16f/0x430 kernel/exit.c:968 SYSC_exit_group kernel/exit.c:979 [inline] SyS_exit_group+0x1d/0x20 kernel/exit.c:977 do_syscall_64+0x29e/0x9d0 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x441619 RSP: 002b:00007fffc8e43478 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 000000000000001b RCX: 0000000000441619 RDX: 0000000000441550 RSI: 0000000000000001 RDI: 0000000000000001 RBP: 00000000004a3229 R08: 0000000000000000 R09: 00000000006cd018 R10: 0000000000000000 R11: 0000000000000202 R12: 00007fffc8e43568 R13: 00000000004023a0 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 4502: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 __do_kmalloc_node mm/slab.c:3682 [inline] __kmalloc_node_track_caller+0x47/0x70 mm/slab.c:3696 __kmalloc_reserve.isra.38+0x3a/0xe0 net/core/skbuff.c:137 __alloc_skb+0x14d/0x780 net/core/skbuff.c:205 alloc_skb include/linux/skbuff.h:987 [inline] alloc_skb_with_frags+0x137/0x760 net/core/skbuff.c:5249 sock_alloc_send_pskb+0x87a/0xae0 net/core/sock.c:2088 packet_alloc_skb net/packet/af_packet.c:2803 [inline] packet_snd net/packet/af_packet.c:2894 [inline] packet_sendmsg+0x1bd1/0x6100 net/packet/af_packet.c:2969 sock_sendmsg_nosec net/socket.c:629 [inline] sock_sendmsg+0xd5/0x120 net/socket.c:639 ___sys_sendmsg+0x805/0x940 net/socket.c:2117 __sys_sendmsg+0x115/0x270 net/socket.c:2155 SYSC_sendmsg net/socket.c:2164 [inline] SyS_sendmsg+0x29/0x30 net/socket.c:2162 do_syscall_64+0x29e/0x9d0 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 Freed by task 4502: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xd9/0x260 mm/slab.c:3813 skb_free_head+0x99/0xc0 net/core/skbuff.c:550 skb_release_data+0x690/0x860 net/core/skbuff.c:570 skb_release_all+0x4a/0x60 net/core/skbuff.c:627 __kfree_skb net/core/skbuff.c:641 [inline] kfree_skb+0x195/0x560 net/core/skbuff.c:659 ip6_tnl_start_xmit+0xa44/0x2290 net/ipv6/ip6_tunnel.c:1411 __netdev_start_xmit include/linux/netdevice.h:4087 [inline] netdev_start_xmit include/linux/netdevice.h:4096 [inline] xmit_one net/core/dev.c:3053 [inline] dev_hard_start_xmit+0x264/0xc10 net/core/dev.c:3069 __dev_queue_xmit+0x2724/0x34c0 net/core/dev.c:3584 dev_queue_xmit+0x17/0x20 net/core/dev.c:3617 packet_snd net/packet/af_packet.c:2944 [inline] packet_sendmsg+0x411d/0x6100 net/packet/af_packet.c:2969 sock_sendmsg_nosec net/socket.c:629 [inline] sock_sendmsg+0xd5/0x120 net/socket.c:639 ___sys_sendmsg+0x805/0x940 net/socket.c:2117 __sys_sendmsg+0x115/0x270 net/socket.c:2155 SYSC_sendmsg net/socket.c:2164 [inline] SyS_sendmsg+0x29/0x30 net/socket.c:2162 do_syscall_64+0x29e/0x9d0 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 The buggy address belongs to the object at ffff8801d8f90a00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 224 bytes inside of 512-byte region [ffff8801d8f90a00, ffff8801d8f90c00) The buggy address belongs to the page: page:ffffea000763e400 count:1 mapcount:0 mapping:ffff8801d8f90000 index:0x0 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffff8801d8f90000 0000000000000000 0000000100000006 raw: ffffea0007634560 ffffea0007627160 ffff8801dac00940 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d8f90980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8801d8f90a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8801d8f90a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801d8f90b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801d8f90b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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