==================================================================
BUG: KASAN: use-after-free in __skb_unlink include/linux/skbuff.h:1753 [inline] at addr ffff8801cac25508
BUG: KASAN: use-after-free in __skb_dequeue include/linux/skbuff.h:1770 [inline] at addr ffff8801cac25508
BUG: KASAN: use-after-free in skb_dequeue+0x162/0x180 net/core/skbuff.c:2381 at addr ffff8801cac25508
Write of size 8 by task syz-executor0/3353
CPU: 1 PID: 3353 Comm: syz-executor0 Not tainted 4.9.39-g72a0c9f #6
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801cfa776c8 ffffffff81eacd59 ffff8801d9ff23c0 ffff8801cac25500
 ffff8801cac255e0 ffffed0039584aa1 ffff8801cac25508 ffff8801cfa776f0
 ffffffff81546bfc ffffed0039584aa1 ffff8801d9ff23c0 0000000000000001
Call Trace:
 [<ffffffff81eacd59>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eacd59>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81546bfc>] kasan_object_err+0x1c/0x70 mm/kasan/report.c:160
 [<ffffffff81546ead>] print_address_description mm/kasan/report.c:198 [inline]
 [<ffffffff81546ead>] kasan_report_error mm/kasan/report.c:287 [inline]
 [<ffffffff81546ead>] kasan_report.part.1+0x20d/0x4e0 mm/kasan/report.c:309
 [<ffffffff8154732c>] kasan_report mm/kasan/report.c:335 [inline]
 [<ffffffff8154732c>] __asan_report_store8_noabort+0x2c/0x30 mm/kasan/report.c:335
 [<ffffffff82f12112>] __skb_unlink include/linux/skbuff.h:1753 [inline]
 [<ffffffff82f12112>] __skb_dequeue include/linux/skbuff.h:1770 [inline]
 [<ffffffff82f12112>] skb_dequeue+0x162/0x180 net/core/skbuff.c:2381
 [<ffffffff82f187f6>] skb_queue_purge+0x26/0x40 net/core/skbuff.c:2418
 [<ffffffff835a0097>] pfkey_sock_destruct+0x157/0x370 net/key/af_key.c:103
 [<ffffffff82f08c93>] __sk_destruct+0x53/0x570 net/core/sock.c:1428
 [<ffffffff82f0d397>] sk_destruct+0x47/0x80 net/core/sock.c:1463
 [<ffffffff82f0d427>] __sk_free+0x57/0x230 net/core/sock.c:1471
 [<ffffffff82f0d623>] sk_free+0x23/0x30 net/core/sock.c:1482
 [<ffffffff8359185e>] sock_put include/net/sock.h:1592 [inline]
 [<ffffffff8359185e>] pfkey_release+0x25e/0x2f0 net/key/af_key.c:189
 [<ffffffff82ef882d>] sock_release+0x8d/0x1e0 net/socket.c:599
 [<ffffffff82ef8996>] sock_close+0x16/0x20 net/socket.c:1046
 [<ffffffff8157bfdc>] __fput+0x28c/0x6e0 fs/file_table.c:208
 [<ffffffff8157c4b5>] ____fput+0x15/0x20 fs/file_table.c:244
 [<ffffffff81196f95>] task_work_run+0x115/0x190 kernel/task_work.c:116
 [<ffffffff8113eb7e>] exit_task_work include/linux/task_work.h:21 [inline]
 [<ffffffff8113eb7e>] do_exit+0x82e/0x2a50 kernel/exit.c:833
 [<ffffffff81145308>] do_group_exit+0x108/0x320 kernel/exit.c:937
 [<ffffffff8116766c>] get_signal+0x55c/0x1600 kernel/signal.c:2315
 [<ffffffff81054b7f>] do_signal+0x7f/0x1940 arch/x86/kernel/signal.c:807
 [<ffffffff81003a15>] exit_to_usermode_loop+0xe5/0x130 arch/x86/entry/common.c:156
 [<ffffffff81006260>] prepare_exit_to_usermode arch/x86/entry/common.c:190 [inline]
 [<ffffffff81006260>] syscall_return_slowpath+0x1a0/0x1e0 arch/x86/entry/common.c:259
 [<ffffffff83965a26>] entry_SYSCALL_64_fastpath+0xc4/0xc6
Object at ffff8801cac25500, in cache skbuff_head_cache size: 224
Allocated:
PID = 3351
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57
 save_stack+0x43/0xd0 mm/kasan/kasan.c:495
 set_track mm/kasan/kasan.c:507 [inline]
 kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:598
 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:537
 slab_post_alloc_hook mm/slab.h:417 [inline]
 slab_alloc_node mm/slub.c:2715 [inline]
 kmem_cache_alloc_node+0x107/0x2a0 mm/slub.c:2751
 __alloc_skb+0xef/0x600 net/core/skbuff.c:219
 alloc_skb include/linux/skbuff.h:919 [inline]
 pfkey_xfrm_policy2msg_prep+0x29/0x50 net/key/af_key.c:2010
 dump_sp+0xa8/0x450 net/key/af_key.c:2655
 xfrm_policy_walk+0x1b1/0x4d0 net/xfrm/xfrm_policy.c:1047
 pfkey_dump_sp+0x42/0x50 net/key/af_key.c:2682
 pfkey_do_dump+0x40/0x2b0 net/key/af_key.c:288
 pfkey_spddump+0x187/0x1e0 net/key/af_key.c:2705
 pfkey_process+0x606/0x710 net/key/af_key.c:2795
 pfkey_sendmsg+0x3af/0x750 net/key/af_key.c:3636
 sock_sendmsg_nosec net/socket.c:635 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:645
 sock_write_iter+0x21d/0x3a0 net/socket.c:843
 new_sync_write fs/read_write.c:499 [inline]
 __vfs_write+0x4ac/0x660 fs/read_write.c:512
 vfs_write+0x170/0x4e0 fs/read_write.c:560
 SYSC_write fs/read_write.c:607 [inline]
 SyS_write+0xd4/0x1a0 fs/read_write.c:599
 entry_SYSCALL_64_fastpath+0x23/0xc6
Freed:
PID = 3352
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57
 save_stack+0x43/0xd0 mm/kasan/kasan.c:495
 set_track mm/kasan/kasan.c:507 [inline]
 kasan_slab_free+0x73/0xc0 mm/kasan/kasan.c:571
 slab_free_hook mm/slub.c:1355 [inline]
 slab_free_freelist_hook mm/slub.c:1377 [inline]
 slab_free mm/slub.c:2958 [inline]
 kmem_cache_free+0xb2/0x2e0 mm/slub.c:2980
 kfree_skbmem+0xd7/0xf0 net/core/skbuff.c:623
 __kfree_skb+0x1d/0x20 net/core/skbuff.c:685
 kfree_skb+0xcc/0x330 net/core/skbuff.c:705
 pfkey_broadcast+0x3d6/0x5f0 net/key/af_key.c:279
 pfkey_do_dump+0x20e/0x2b0 net/key/af_key.c:299
 pfkey_recvmsg+0x443/0x4f0 net/key/af_key.c:3680
 sock_recvmsg_nosec net/socket.c:737 [inline]
 sock_recvmsg+0xc9/0x110 net/socket.c:744
 SYSC_recvfrom+0x1e3/0x300 net/socket.c:1721
 SyS_recvfrom+0x40/0x50 net/socket.c:1694
 entry_SYSCALL_64_fastpath+0x23/0xc6
Memory state around the buggy address:
 ffff8801cac25400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801cac25480: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8801cac25500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                      ^
 ffff8801cac25580: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff8801cac25600: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
==================================================================
==================================================================
BUG: KASAN: use-after-free in __skb_unlink include/linux/skbuff.h:1750 [inline] at addr ffff8801cac25500
BUG: KASAN: use-after-free in __skb_dequeue include/linux/skbuff.h:1770 [inline] at addr ffff8801cac25500
BUG: KASAN: use-after-free in skb_dequeue+0x176/0x180 net/core/skbuff.c:2381 at addr ffff8801cac25500
Read of size 8 by task syz-executor0/3353
CPU: 1 PID: 3353 Comm: syz-executor0 Tainted: G    B           4.9.39-g72a0c9f #6
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801cfa776c8 ffffffff81eacd59 ffff8801d9ff23c0 ffff8801cac25500
 ffff8801cac255e0 ffffed0039584aa0 ffff8801cac25500 ffff8801cfa776f0
 ffffffff81546bfc ffffed0039584aa0 ffff8801d9ff23c0 0000000000000000
Call Trace:
 [<ffffffff81eacd59>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eacd59>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81546bfc>] kasan_object_err+0x1c/0x70 mm/kasan/report.c:160
 [<ffffffff81546ead>] print_address_description mm/kasan/report.c:198 [inline]
 [<ffffffff81546ead>] kasan_report_error mm/kasan/report.c:287 [inline]
 [<ffffffff81546ead>] kasan_report.part.1+0x20d/0x4e0 mm/kasan/report.c:309
 [<ffffffff81547239>] kasan_report mm/kasan/report.c:330 [inline]
 [<ffffffff81547239>] __asan_report_load8_noabort+0x29/0x30 mm/kasan/report.c:330
 [<ffffffff82f12126>] __skb_unlink include/linux/skbuff.h:1750 [inline]
 [<ffffffff82f12126>] __skb_dequeue include/linux/skbuff.h:1770 [inline]
 [<ffffffff82f12126>] skb_dequeue+0x176/0x180 net/core/skbuff.c:2381
 [<ffffffff82f187f6>] skb_queue_purge+0x26/0x40 net/core/skbuff.c:2418
 [<ffffffff835a0097>] pfkey_sock_destruct+0x157/0x370 net/key/af_key.c:103
 [<ffffffff82f08c93>] __sk_destruct+0x53/0x570 net/core/sock.c:1428
 [<ffffffff82f0d397>] sk_destruct+0x47/0x80 net/core/sock.c:1463
 [<ffffffff82f0d427>] __sk_free+0x57/0x230 net/core/sock.c:1471
 [<ffffffff82f0d623>] sk_free+0x23/0x30 net/core/sock.c:1482
 [<ffffffff8359185e>] sock_put include/net/sock.h:1592 [inline]
 [<ffffffff8359185e>] pfkey_release+0x25e/0x2f0 net/key/af_key.c:189
 [<ffffffff82ef882d>] sock_release+0x8d/0x1e0 net/socket.c:599
 [<ffffffff82ef8996>] sock_close+0x16/0x20 net/socket.c:1046
 [<ffffffff8157bfdc>] __fput+0x28c/0x6e0 fs/file_table.c:208
 [<ffffffff8157c4b5>] ____fput+0x15/0x20 fs/file_table.c:244
 [<ffffffff81196f95>] task_work_run+0x115/0x190 kernel/task_work.c:116
 [<ffffffff8113eb7e>] exit_task_work include/linux/task_work.h:21 [inline]
 [<ffffffff8113eb7e>] do_exit+0x82e/0x2a50 kernel/exit.c:833
 [<ffffffff81145308>] do_group_exit+0x108/0x320 kernel/exit.c:937
 [<ffffffff8116766c>] get_signal+0x55c/0x1600 kernel/signal.c:2315
 [<ffffffff81054b7f>] do_signal+0x7f/0x1940 arch/x86/kernel/signal.c:807
 [<ffffffff81003a15>] exit_to_usermode_loop+0xe5/0x130 arch/x86/entry/common.c:156
 [<ffffffff81006260>] prepare_exit_to_usermode arch/x86/entry/common.c:190 [inline]
 [<ffffffff81006260>] syscall_return_slowpath+0x1a0/0x1e0 arch/x86/entry/common.c:259
 [<ffffffff83965a26>] entry_SYSCALL_64_fastpath+0xc4/0xc6
Object at ffff8801cac25500, in cache skbuff_head_cache size: 224
Allocated:
PID = 3351
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57
 save_stack+0x43/0xd0 mm/kasan/kasan.c:495
 set_track mm/kasan/kasan.c:507 [inline]
 kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:598
 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:537
 slab_post_alloc_hook mm/slab.h:417 [inline]
 slab_alloc_node mm/slub.c:2715 [inline]
 kmem_cache_alloc_node+0x107/0x2a0 mm/slub.c:2751
 __alloc_skb+0xef/0x600 net/core/skbuff.c:219
 alloc_skb include/linux/skbuff.h:919 [inline]
 pfkey_xfrm_policy2msg_prep+0x29/0x50 net/key/af_key.c:2010
 dump_sp+0xa8/0x450 net/key/af_key.c:2655
 xfrm_policy_walk+0x1b1/0x4d0 net/xfrm/xfrm_policy.c:1047
 pfkey_dump_sp+0x42/0x50 net/key/af_key.c:2682
 pfkey_do_dump+0x40/0x2b0 net/key/af_key.c:288
 pfkey_spddump+0x187/0x1e0 net/key/af_key.c:2705
 pfkey_process+0x606/0x710 net/key/af_key.c:2795
 pfkey_sendmsg+0x3af/0x750 net/key/af_key.c:3636
 sock_sendmsg_nosec net/socket.c:635 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:645
 sock_write_iter+0x21d/0x3a0 net/socket.c:843
 new_sync_write fs/read_write.c:499 [inline]
 __vfs_write+0x4ac/0x660 fs/read_write.c:512
 vfs_write+0x170/0x4e0 fs/read_write.c:560
 SYSC_write fs/read_write.c:607 [inline]
 SyS_write+0xd4/0x1a0 fs/read_write.c:599
 entry_SYSCALL_64_fastpath+0x23/0xc6
Freed:
PID = 3352
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57
 save_stack+0x43/0xd0 mm/kasan/kasan.c:495
 set_track mm/kasan/kasan.c:507 [inline]
 kasan_slab_free+0x73/0xc0 mm/kasan/kasan.c:571
 slab_free_hook mm/slub.c:1355 [inline]
 slab_free_freelist_hook mm/slub.c:1377 [inline]
 slab_free mm/slub.c:2958 [inline]
 kmem_cache_free+0xb2/0x2e0 mm/slub.c:2980
 kfree_skbmem+0xd7/0xf0 net/core/skbuff.c:623
 __kfree_skb+0x1d/0x20 net/core/skbuff.c:685
 kfree_skb+0xcc/0x330 net/core/skbuff.c:705
 pfkey_broadcast+0x3d6/0x5f0 net/key/af_key.c:279
 pfkey_do_dump+0x20e/0x2b0 net/key/af_key.c:299
 pfkey_recvmsg+0x443/0x4f0 net/key/af_key.c:3680
 sock_recvmsg_nosec net/socket.c:737 [inline]
 sock_recvmsg+0xc9/0x110 net/socket.c:744
 SYSC_recvfrom+0x1e3/0x300 net/socket.c:1721
 SyS_recvfrom+0x40/0x50 net/socket.c:1694
 entry_SYSCALL_64_fastpath+0x23/0xc6
Memory state around the buggy address:
 ffff8801cac25400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb