Date:   Sun, 17 Dec 2017 21:50:01 -0800
From:   syzbot 
        <bot+29cf0a34886ca39d13fc0451b174140973b5bed3@...kaller.appspotmail.com>
To:     davem@...emloft.net, herbert@...dor.apana.org.au,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: KASAN: use-after-free Read in __list_del_entry_valid (2)

Hello,

syzkaller hit the following crash on  
82bcf1def3b5f1251177ad47c44f7e17af039b4b
git://git.cmpxchg.org/linux-mmots.git/master
compiler: gcc (GCC) 7.1.1 20170620
.config is attached
Raw console output is attached.
C reproducer is attached
syzkaller reproducer is attached. See https://goo.gl/kgGztJ
for information about syzkaller reproducers


==================================================================
BUG: KASAN: use-after-free in __list_del_entry_valid+0x11d/0x150  
lib/list_debug.c:42
Read of size 8 at addr ffff8801c4471248 by task syzkaller960526/6767

CPU: 0 PID: 6767 Comm: syzkaller960526 Not tainted 4.15.0-rc2-mm1+ #39
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Call Trace:
  __dump_stack lib/dump_stack.c:17 [inline]
  dump_stack+0x194/0x257 lib/dump_stack.c:53
  print_address_description+0x73/0x250 mm/kasan/report.c:252
  kasan_report_error mm/kasan/report.c:351 [inline]
  kasan_report+0x25b/0x340 mm/kasan/report.c:409
  __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:430
  __list_del_entry_valid+0x11d/0x150 lib/list_debug.c:42
  __list_del_entry include/linux/list.h:117 [inline]
  list_del include/linux/list.h:125 [inline]
  crypto_larval_kill+0x79/0x2e0 crypto/api.c:164
  crypto_alg_mod_lookup+0x178/0x1b0 crypto/api.c:283
  crypto_find_alg crypto/api.c:501 [inline]
  crypto_alloc_tfm+0xf3/0x2f0 crypto/api.c:534
  crypto_alloc_aead+0x2c/0x40 crypto/aead.c:342
  aead_bind+0x70/0x140 crypto/algif_aead.c:482
  alg_bind+0x1ab/0x440 crypto/af_alg.c:179
  SYSC_bind+0x1b4/0x3f0 net/socket.c:1454
  SyS_bind+0x24/0x30 net/socket.c:1440
  entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x4406f9
RSP: 002b:00007ffe2d384878 EFLAGS: 00000203 ORIG_RAX: 0000000000000031
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004406f9
RDX: 0000000000000058 RSI: 0000000020269000 RDI: 0000000000000003
RBP: 000000000000ac2d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000203 R12: 0000000000000000
R13: 0000000000401c30 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 6767:
  save_stack+0x43/0xd0 mm/kasan/kasan.c:447
  set_track mm/kasan/kasan.c:459 [inline]
  kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551
  kmem_cache_alloc_trace+0x136/0x750 mm/slab.c:3614
  kmalloc include/linux/slab.h:516 [inline]
  kzalloc include/linux/slab.h:705 [inline]
  crypto_larval_alloc+0x51/0x1e0 crypto/api.c:114
  crypto_larval_add crypto/api.c:136 [inline]
  crypto_larval_lookup.part.8+0x194/0x400 crypto/api.c:232
  crypto_larval_lookup crypto/api.c:212 [inline]
  crypto_alg_mod_lookup+0x77/0x1b0 crypto/api.c:271
  crypto_find_alg crypto/api.c:501 [inline]
  crypto_alloc_tfm+0xf3/0x2f0 crypto/api.c:534
  crypto_alloc_aead+0x2c/0x40 crypto/aead.c:342
  aead_bind+0x70/0x140 crypto/algif_aead.c:482
  alg_bind+0x1ab/0x440 crypto/af_alg.c:179
  SYSC_bind+0x1b4/0x3f0 net/socket.c:1454
  SyS_bind+0x24/0x30 net/socket.c:1440
  entry_SYSCALL_64_fastpath+0x1f/0x96

Freed by task 3157:
  save_stack+0x43/0xd0 mm/kasan/kasan.c:447
  set_track mm/kasan/kasan.c:459 [inline]
  kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524
  __cache_free mm/slab.c:3492 [inline]
  kfree+0xca/0x250 mm/slab.c:3807
  crypto_larval_destroy+0x110/0x150 crypto/api.c:107
  crypto_alg_put crypto/internal.h:116 [inline]
  crypto_larval_kill+0x1e8/0x2e0 crypto/api.c:167
  crypto_wait_for_test+0x87/0xb0 crypto/algapi.c:351
  crypto_register_instance+0x2bf/0x430 crypto/algapi.c:558
  aead_register_instance+0x161/0x1c0 crypto/aead.c:421
  pcrypt_create_aead crypto/pcrypt.c:322 [inline]
  pcrypt_create+0x542/0x6c0 crypto/pcrypt.c:346
  cryptomgr_probe+0x74/0x240 crypto/algboss.c:75
  kthread+0x37a/0x440 kernel/kthread.c:238
  ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:524

The buggy address belongs to the object at ffff8801c4471240
  which belongs to the cache kmalloc-1024 of size 1024
The buggy address is located 8 bytes inside of
  1024-byte region [ffff8801c4471240, ffff8801c4471640)
The buggy address belongs to the page:
page:000000007b38bfe6 count:1 mapcount:0 mapping:000000009d8bf81b index:0x0  
compound_mapcount: 0
flags: 0x2fffc0000008100(slab|head)
raw: 02fffc0000008100 ffff8801c4470040 0000000000000000 0000000100000007
raw: ffffea000713f920 ffffea000711a120 ffff8801dac00ac0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
  ffff8801c4471100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
  ffff8801c4471180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ffff8801c4471200: fb fb fb fb fb fb fb fb fb fb fb fb 00 00 00 00
                                               ^
  ffff8801c4471280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  ffff8801c4471300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================


---
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