syzbot

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BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:345 [inline]
BUG: KASAN: slab-out-of-bounds in pfkey_msg2xfrm_state net/key/af_key.c:1181 [inline]
BUG: KASAN: slab-out-of-bounds in pfkey_add+0x272d/0x3210 net/key/af_key.c:1499
Read of size 8192 at addr ffff8801b34925c0 by task syzkaller440049/4471

CPU: 0 PID: 4471 Comm: syzkaller440049 Not tainted 4.16.0+ #3
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+0x242/0x2fe 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
 memcpy+0x23/0x50 mm/kasan/kasan.c:302
 memcpy include/linux/string.h:345 [inline]
 pfkey_msg2xfrm_state net/key/af_key.c:1181 [inline]
 pfkey_add+0x272d/0x3210 net/key/af_key.c:1499
 pfkey_process+0x7cc/0x8a0 net/key/af_key.c:2819
 pfkey_sendmsg+0x5f4/0x1050 net/key/af_key.c:3658
 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
RIP: 0033:0x43fd19
RSP: 002b:00007ffeef8e7678 EFLAGS: 00000213 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd19
RDX: 0000000000000000 RSI: 0000000020196fe4 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8
R10: 00000000004002c8 R11: 0000000000000213 R12: 0000000000401640
R13: 00000000004016d0 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 4471:
 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]
 pfkey_sendmsg+0x250/0x1050 net/key/af_key.c:3645
 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 0:
(stack is not available)

The buggy address belongs to the object at ffff8801b3492580
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 64 bytes inside of
 512-byte region [ffff8801b3492580, ffff8801b3492780)
The buggy address belongs to the page:
page:ffffea0006cd2480 count:1 mapcount:0 mapping:ffff8801b3492080 index:0x0
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801b3492080 0000000000000000 0000000100000006
raw: ffffea00073d9be0 ffff8801dac01748 ffff8801dac00940 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801b3492680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801b3492700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8801b3492780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff8801b3492800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801b3492880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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