random: sshd: uninitialized urandom read (32 bytes read, 114 bits of entropy available)
==================================================================
BUG: KASAN: slab-out-of-bounds in pfkey_msg2xfrm_state net/key/af_key.c:1219 [inline]
BUG: KASAN: slab-out-of-bounds in pfkey_add+0x153f/0x3490 net/key/af_key.c:1498
Read of size 8192 at addr ffff8800b4fc8518 by task syzkaller878019/3324

CPU: 0 PID: 3324 Comm: syzkaller878019 Not tainted 4.4.107-g610c835 #4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 a9db625c62654c95 ffff8801d17276f8 ffffffff81d0457d
 ffffea0002d3f200 ffff8800b4fc8518 0000000000000000 ffff8800b4fc8700
 ffff8801d1727938 ffff8801d1727730 ffffffff814fbb23 ffff8800b4fc8518
Call Trace:
 [<ffffffff81d0457d>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d0457d>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff814fbb23>] print_address_description+0x73/0x260 mm/kasan/report.c:252
 [<ffffffff814fc035>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff814fc035>] kasan_report+0x285/0x370 mm/kasan/report.c:408
 [<ffffffff814faa77>] check_memory_region_inline mm/kasan/kasan.c:325 [inline]
 [<ffffffff814faa77>] check_memory_region+0x137/0x190 mm/kasan/kasan.c:332
 [<ffffffff814fafb3>] memcpy+0x23/0x50 mm/kasan/kasan.c:367
 [<ffffffff83444fff>] pfkey_msg2xfrm_state net/key/af_key.c:1219 [inline]
 [<ffffffff83444fff>] pfkey_add+0x153f/0x3490 net/key/af_key.c:1498
 [<ffffffff8344964e>] pfkey_process+0x61e/0x730 net/key/af_key.c:2826
 [<ffffffff8344aef9>] pfkey_sendmsg+0x3a9/0x760 net/key/af_key.c:3670
 [<ffffffff82dec59a>] sock_sendmsg_nosec net/socket.c:625 [inline]
 [<ffffffff82dec59a>] sock_sendmsg+0xca/0x110 net/socket.c:635
 [<ffffffff82dee171>] ___sys_sendmsg+0x6c1/0x7c0 net/socket.c:1962
 [<ffffffff82df01c3>] __sys_sendmsg+0xd3/0x190 net/socket.c:1996
 [<ffffffff82eda28a>] C_SYSC_sendmsg net/compat.c:720 [inline]
 [<ffffffff82eda28a>] compat_SyS_sendmsg+0x2a/0x40 net/compat.c:718
 [<ffffffff81006d84>] do_syscall_32_irqs_on arch/x86/entry/common.c:390 [inline]
 [<ffffffff81006d84>] do_fast_syscall_32+0x314/0x890 arch/x86/entry/common.c:457
 [<ffffffff837754d7>] sysenter_flags_fixed+0xd/0x17

Allocated by task 3324:
 [<ffffffff81035c86>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814fab93>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814fae5d>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814fae5d>] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:616
 [<ffffffff814fb634>] kasan_krealloc+0x64/0x80 mm/kasan/kasan.c:654
 [<ffffffff814f4422>] ksize+0x92/0xf0 mm/slub.c:3727
 [<ffffffff82e076a2>] __alloc_skb+0x132/0x600 net/core/skbuff.c:237
 [<ffffffff8344ac85>] alloc_skb include/linux/skbuff.h:815 [inline]
 [<ffffffff8344ac85>] pfkey_sendmsg+0x135/0x760 net/key/af_key.c:3657
 [<ffffffff82dec59a>] sock_sendmsg_nosec net/socket.c:625 [inline]
 [<ffffffff82dec59a>] sock_sendmsg+0xca/0x110 net/socket.c:635
 [<ffffffff82dee171>] ___sys_sendmsg+0x6c1/0x7c0 net/socket.c:1962
 [<ffffffff82df01c3>] __sys_sendmsg+0xd3/0x190 net/socket.c:1996
 [<ffffffff82eda28a>] C_SYSC_sendmsg net/compat.c:720 [inline]
 [<ffffffff82eda28a>] compat_SyS_sendmsg+0x2a/0x40 net/compat.c:718
 [<ffffffff81006d84>] do_syscall_32_irqs_on arch/x86/entry/common.c:390 [inline]
 [<ffffffff81006d84>] do_fast_syscall_32+0x314/0x890 arch/x86/entry/common.c:457
 [<ffffffff837754d7>] sysenter_flags_fixed+0xd/0x17

Freed by task 1767:
 [<ffffffff81035c86>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814fab93>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814fb4b2>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814fb4b2>] kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:589
 [<ffffffff814f7f3c>] slab_free_hook mm/slub.c:1383 [inline]
 [<ffffffff814f7f3c>] slab_free_freelist_hook mm/slub.c:1405 [inline]
 [<ffffffff814f7f3c>] slab_free mm/slub.c:2859 [inline]
 [<ffffffff814f7f3c>] kfree+0xfc/0x300 mm/slub.c:3749
 [<ffffffff82e0667d>] skb_free_head net/core/skbuff.c:571 [inline]
 [<ffffffff82e0667d>] skb_release_data+0x2ed/0x3b0 net/core/skbuff.c:602
 [<ffffffff82e0678a>] skb_release_all+0x4a/0x60 net/core/skbuff.c:661
 [<ffffffff82e06d93>] __kfree_skb net/core/skbuff.c:675 [inline]
 [<ffffffff82e06d93>] consume_skb+0xf3/0x3d0 net/core/skbuff.c:748
 [<ffffffff82e23e6a>] skb_free_datagram+0x1a/0xe0 net/core/datagram.c:280
 [<ffffffff82f817fb>] netlink_recvmsg+0x60b/0xe10 net/netlink/af_netlink.c:1882
 [<ffffffff82de8fcc>] sock_recvmsg_nosec net/socket.c:727 [inline]
 [<ffffffff82de8fcc>] sock_recvmsg+0x8c/0xc0 net/socket.c:735
 [<ffffffff82dee4dd>] ___sys_recvmsg+0x26d/0x560 net/socket.c:2116
 [<ffffffff82df06e3>] __sys_recvmsg+0xd3/0x190 net/socket.c:2162
 [<ffffffff82df07cd>] SYSC_recvmsg net/socket.c:2174 [inline]
 [<ffffffff82df07cd>] SyS_recvmsg+0x2d/0x50 net/socket.c:2169
 [<ffffffff83773d36>] entry_SYSCALL_64_fastpath+0x16/0x76

The buggy address belongs to the object at ffff8800b4fc8500
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 24 bytes inside of
 512-byte region [ffff8800b4fc8500, ffff8800b4fc8700)
The buggy address belongs to the page:
PANIC: double fault, error_code: 0x0
CPU: 0 PID: 3324 Comm: syzkaller878019 Not tainted 4.4.107-g610c835 #4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d33f0000 task.stack: ffff8801d1720000
RIP: 0010:[<ffffffff8148e36d>]  [<ffffffff8148e36d>] dump_page_badflags+0xd/0x250 mm/debug.c:84
RSP: 0018:ffff880100000000  EFLAGS: 00010046
RAX: ffff8801d33f0000 RBX: ffffea0002d3f200 RCX: ffffffff8148e4e0
RDX: 0000000000000000 RSI: ffffffff838a7f60 RDI: ffffea0002d3f200
RBP: ffff880100000018 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000002 R11: fffffbfff0ad641e R12: 0000000000000000
R13: ffffffff838a7f60 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:0000000009c61840
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: ffff8800fffffff8 CR3: 00000000bb2db000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:

Call Trace:
 <UNK> 
Code: ff e8 38 de 06 00 e9 50 fd ff ff e8 2e de 06 00 e9 1d fd ff ff 66 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 57 41 56 41 55 49 89 f5 <41> 54 49 89 d4 53 48 89 fb 48 83 ec 08 e8 b1 f7 ec ff 48 8d 7b