syzbot

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BUG: KASAN: slab-out-of-bounds in __xfrm_state_lookup.isra.0+0x809/0x870 net/xfrm/xfrm_state.c:938
Read of size 8 at addr ffff888066b14db8 by task syz-executor.1/25703

CPU: 1 PID: 25703 Comm: syz-executor.1 Not tainted 5.10.0-rc3-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+0x107/0x163 lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xae/0x4c8 mm/kasan/report.c:385
 __kasan_report mm/kasan/report.c:545 [inline]
 kasan_report.cold+0x1f/0x37 mm/kasan/report.c:562
 __xfrm_state_lookup.isra.0+0x809/0x870 net/xfrm/xfrm_state.c:938
 xfrm_state_find+0x1b97/0x4be0 net/xfrm/xfrm_state.c:1103
 xfrm_tmpl_resolve_one net/xfrm/xfrm_policy.c:2384 [inline]
 xfrm_tmpl_resolve+0x2f3/0xd40 net/xfrm/xfrm_policy.c:2429
 xfrm_resolve_and_create_bundle+0x123/0x2590 net/xfrm/xfrm_policy.c:2719
 xfrm_lookup_with_ifid+0x235/0x2130 net/xfrm/xfrm_policy.c:3053
 xfrm_lookup net/xfrm/xfrm_policy.c:3177 [inline]
 xfrm_lookup_route+0x36/0x1e0 net/xfrm/xfrm_policy.c:3188
 ip6_dst_lookup_flow+0x159/0x1d0 net/ipv6/ip6_output.c:1160
 rawv6_sendmsg+0xc82/0x38f0 net/ipv6/raw.c:928
 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:817
 sock_sendmsg_nosec net/socket.c:651 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:671
 ____sys_sendmsg+0x331/0x810 net/socket.c:2353
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2407
 __sys_sendmmsg+0x292/0x470 net/socket.c:2490
 __compat_sys_sendmmsg net/compat.c:361 [inline]
 __do_compat_sys_sendmmsg net/compat.c:368 [inline]
 __se_compat_sys_sendmmsg net/compat.c:365 [inline]
 __ia32_compat_sys_sendmmsg+0x9b/0x100 net/compat.c:365
 do_syscall_32_irqs_on arch/x86/entry/common.c:78 [inline]
 __do_fast_syscall_32+0x56/0x80 arch/x86/entry/common.c:137
 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:160
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
RIP: 0023:0xf7f70549
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000f556a0cc EFLAGS: 00000296 ORIG_RAX: 0000000000000159
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000020000480
RDX: 00000000000002e9 RSI: 00000000000001f4 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 3128:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
 kasan_set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc.constprop.0+0xc2/0xd0 mm/kasan/common.c:461
 kmalloc include/linux/slab.h:557 [inline]
 kzalloc include/linux/slab.h:664 [inline]
 xfrm_hash_alloc+0xbd/0xe0 net/xfrm/xfrm_hash.c:21
 xfrm_hash_resize+0x96/0x1550 net/xfrm/xfrm_state.c:135
 process_one_work+0x933/0x15a0 kernel/workqueue.c:2272
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2418
 kthread+0x3af/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

Last call_rcu():
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
 kasan_record_aux_stack+0xc0/0xf0 mm/kasan/generic.c:346
 __call_rcu kernel/rcu/tree.c:2953 [inline]
 call_rcu+0xbb/0x700 kernel/rcu/tree.c:3027
 netlink_release+0xd43/0x1cf0 net/netlink/af_netlink.c:802
 __sock_release+0xcd/0x280 net/socket.c:596
 sock_close+0x18/0x20 net/socket.c:1277
 __fput+0x285/0x920 fs/file_table.c:281
 task_work_run+0xdd/0x190 kernel/task_work.c:151
 exit_task_work include/linux/task_work.h:30 [inline]
 do_exit+0xb64/0x29b0 kernel/exit.c:809
 do_group_exit+0x125/0x310 kernel/exit.c:906
 __do_sys_exit_group kernel/exit.c:917 [inline]
 __se_sys_exit_group kernel/exit.c:915 [inline]
 __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:915
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Second to last call_rcu():
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
 kasan_record_aux_stack+0xc0/0xf0 mm/kasan/generic.c:346
 __call_rcu kernel/rcu/tree.c:2953 [inline]
 call_rcu+0xbb/0x700 kernel/rcu/tree.c:3027
 netlink_release+0xd43/0x1cf0 net/netlink/af_netlink.c:802
 __sock_release+0xcd/0x280 net/socket.c:596
 sock_close+0x18/0x20 net/socket.c:1277
 __fput+0x285/0x920 fs/file_table.c:281
 task_work_run+0xdd/0x190 kernel/task_work.c:151
 exit_task_work include/linux/task_work.h:30 [inline]
 do_exit+0xb64/0x29b0 kernel/exit.c:809
 do_group_exit+0x125/0x310 kernel/exit.c:906
 __do_sys_exit_group kernel/exit.c:917 [inline]
 __se_sys_exit_group kernel/exit.c:915 [inline]
 __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:915
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

The buggy address belongs to the object at ffff888066b14000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 1464 bytes to the right of
 2048-byte region [ffff888066b14000, ffff888066b14800)
The buggy address belongs to the page:
page:0000000013eb67c1 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x66b10
head:0000000013eb67c1 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head)
raw: 00fff00000010200 0000000000000000 0000000600000001 ffff888010042000
raw: 0000000000000000 0000000080080008 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888066b14c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888066b14d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888066b14d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                        ^
 ffff888066b14e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888066b14e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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