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BUG: KASAN: slab-out-of-bounds in pfkey_msg2xfrm_state net/key/af_key.c:1188 [inline]
BUG: KASAN: slab-out-of-bounds in pfkey_add+0x2551/0x3230 net/key/af_key.c:1506
Read of size 3104 at addr ffff88019bd79918 by task syz-executor3/7043

CPU: 1 PID: 7043 Comm: syz-executor3 Not tainted 4.9.105-gd7e64f8 #43
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d7ac76d0 ffffffff81eb41a9 ffffea00066f5e00 ffff88019bd79918
 0000000000000000 ffff88019bd79b00 ffff88019bd79900 ffff8801d7ac7708
 ffffffff81567e49 ffff88019bd79918 0000000000000c20 0000000000000000
Call Trace:
 [<ffffffff81eb41a9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb41a9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81567e49>] print_address_description+0x6c/0x234 mm/kasan/report.c:256
 [<ffffffff81568253>] kasan_report_error mm/kasan/report.c:355 [inline]
 [<ffffffff81568253>] kasan_report.cold.6+0x242/0x2fe mm/kasan/report.c:412
 [<ffffffff8153ad0f>] check_memory_region_inline mm/kasan/kasan.c:318 [inline]
 [<ffffffff8153ad0f>] check_memory_region+0x14f/0x1b0 mm/kasan/kasan.c:325
 [<ffffffff8153b353>] memcpy+0x23/0x50 mm/kasan/kasan.c:360
 [<ffffffff836b0751>] pfkey_msg2xfrm_state net/key/af_key.c:1188 [inline]
 [<ffffffff836b0751>] pfkey_add+0x2551/0x3230 net/key/af_key.c:1506
 [<ffffffff836a6e91>] pfkey_process+0x671/0x740 net/key/af_key.c:2834
 [<ffffffff836a86b6>] pfkey_sendmsg+0x346/0xae0 net/key/af_key.c:3678
 [<ffffffff83016fcc>] sock_sendmsg_nosec net/socket.c:635 [inline]
 [<ffffffff83016fcc>] sock_sendmsg+0xcc/0x110 net/socket.c:645
 [<ffffffff83018a6c>] ___sys_sendmsg+0x6fc/0x840 net/socket.c:1969
 [<ffffffff8301aad9>] __sys_sendmsg+0xd9/0x190 net/socket.c:2003
 [<ffffffff8311c80a>] C_SYSC_sendmsg net/compat.c:736 [inline]
 [<ffffffff8311c80a>] compat_SyS_sendmsg+0x2a/0x40 net/compat.c:734
 [<ffffffff81006da7>] do_syscall_32_irqs_on arch/x86/entry/common.c:325 [inline]
 [<ffffffff81006da7>] do_fast_syscall_32+0x2f7/0x870 arch/x86/entry/common.c:387
 [<ffffffff839fb210>] entry_SYSENTER_compat+0x90/0xa2 arch/x86/entry/entry_64_compat.S:137

Allocated by task 7043:
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57
 save_stack+0x43/0xd0 mm/kasan/kasan.c:505
 set_track mm/kasan/kasan.c:517 [inline]
 kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:609
 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:547
 slab_post_alloc_hook mm/slab.h:417 [inline]
 slab_alloc_node mm/slub.c:2715 [inline]
 slab_alloc mm/slub.c:2723 [inline]
 __kmalloc_track_caller+0xdc/0x2b0 mm/slub.c:4232
 __kmalloc_reserve.isra.37+0x33/0xc0 net/core/skbuff.c:138
 __alloc_skb+0x11a/0x600 net/core/skbuff.c:231
 alloc_skb include/linux/skbuff.h:919 [inline]
 pfkey_sendmsg+0xfe/0xae0 net/key/af_key.c:3665
 sock_sendmsg_nosec net/socket.c:635 [inline]
 sock_sendmsg+0xcc/0x110 net/socket.c:645
 ___sys_sendmsg+0x6fc/0x840 net/socket.c:1969
 __sys_sendmsg+0xd9/0x190 net/socket.c:2003
 C_SYSC_sendmsg net/compat.c:736 [inline]
 compat_SyS_sendmsg+0x2a/0x40 net/compat.c:734
 do_syscall_32_irqs_on arch/x86/entry/common.c:325 [inline]
 do_fast_syscall_32+0x2f7/0x870 arch/x86/entry/common.c:387
 entry_SYSENTER_compat+0x90/0xa2 arch/x86/entry/entry_64_compat.S:137

Freed by task 2041:
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57
 save_stack+0x43/0xd0 mm/kasan/kasan.c:505
 set_track mm/kasan/kasan.c:517 [inline]
 kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:582
 slab_free_hook mm/slub.c:1355 [inline]
 slab_free_freelist_hook mm/slub.c:1377 [inline]
 slab_free mm/slub.c:2958 [inline]
 kfree+0xfb/0x310 mm/slub.c:3878
 skb_free_head+0x8b/0xb0 net/core/skbuff.c:580
 skb_release_data+0x329/0x400 net/core/skbuff.c:611
 skb_release_all+0x4a/0x60 net/core/skbuff.c:670
 __kfree_skb net/core/skbuff.c:684 [inline]
 consume_skb+0xc6/0x340 net/core/skbuff.c:757
 skb_free_datagram+0x1a/0xe0 net/core/datagram.c:299
 unix_dgram_recvmsg+0x8ce/0xec0 net/unix/af_unix.c:2202
 sock_recvmsg_nosec net/socket.c:737 [inline]
 sock_recvmsg+0xc6/0x110 net/socket.c:744
 SYSC_recvfrom+0x1fc/0x350 net/socket.c:1722
 SyS_recvfrom+0x40/0x50 net/socket.c:1694
 do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 entry_SYSCALL_64_after_swapgs+0x5d/0xdb

The buggy address belongs to the object at ffff88019bd79900
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 24 bytes inside of
 512-byte region [ffff88019bd79900, ffff88019bd79b00)
The buggy address belongs to the page:
page:ffffea00066f5e00 count:1 mapcount:0 mapping:          (null) index:0xffff88019bd78280 compound_mapcount: 0
flags: 0x8000000000004080(slab|head)
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88019bd79a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88019bd79a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88019bd79b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff88019bd79b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88019bd79c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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