Date:   Mon, 27 Nov 2017 10:56:47 -0800
From:   syzbot 
        <bot+3401d9494b9380f7244bcc7fec49680878fccba6@...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: general protection fault in blkcipher_walk_done

Hello,

syzkaller hit the following crash on  
1ea8d039f9edcfefb20d8ddfe136930f6e551529
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


kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
    (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 3459 Comm: syzkaller843837 Not tainted 4.14.0-mm1+ #25
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
task: ffff8801bfe7e0c0 task.stack: ffff8801c01f8000
RIP: 0010:scatterwalk_start include/crypto/scatterwalk.h:86 [inline]
RIP: 0010:scatterwalk_pagedone include/crypto/scatterwalk.h:111 [inline]
RIP: 0010:scatterwalk_done include/crypto/scatterwalk.h:119 [inline]
RIP: 0010:blkcipher_walk_done+0x447/0xde0 crypto/blkcipher.c:125
RSP: 0018:ffff8801c01ff6f0 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 00000000000003ef RCX: ffff8801c01ff7e0
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000008
RBP: ffff8801c01ff740 R08: ffffed00372e1e02 R09: 0000000000000010
R10: 0000000000000000 R11: ffffed00372e1e01 R12: ffff8801c01ff8b8
R13: ffff8801c01ff7a0 R14: ffff8801c01ff7e8 R15: ffff8801c0189110
FS:  00007f4f6c774700(0000) GS:ffff8801db400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020c13000 CR3: 00000001d9ef0000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
  skcipher_null_crypt+0x1da/0x2d0 crypto/crypto_null.c:91
  skcipher_crypt_blkcipher crypto/skcipher.c:619 [inline]
  skcipher_encrypt_blkcipher+0x213/0x310 crypto/skcipher.c:628
  crypto_skcipher_encrypt include/crypto/skcipher.h:445 [inline]
  crypto_aead_copy_sgl crypto/algif_aead.c:90 [inline]
  _aead_recvmsg crypto/algif_aead.c:210 [inline]
  aead_recvmsg+0x7db/0x1970 crypto/algif_aead.c:313
  aead_recvmsg_nokey+0x60/0x80 crypto/algif_aead.c:431
  sock_recvmsg_nosec net/socket.c:805 [inline]
  sock_recvmsg+0xc9/0x110 net/socket.c:812
  ___sys_recvmsg+0x29b/0x630 net/socket.c:2207
  __sys_recvmsg+0xe2/0x210 net/socket.c:2252
  SYSC_recvmsg net/socket.c:2264 [inline]
  SyS_recvmsg+0x2d/0x50 net/socket.c:2259
  entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x4463e9
RSP: 002b:00007f4f6c773dc8 EFLAGS: 00000202 ORIG_RAX: 000000000000002f
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004463e9
RDX: 0000000000002103 RSI: 0000000020709fc8 RDI: 0000000000000008
RBP: 0000000000000086 R08: 00007f4f6c774700 R09: 00007f4f6c774700
R10: 00007f4f6c774700 R11: 0000000000000202 R12: 0000000000000000
R13: 00007ffd952b0bbf R14: 00007f4f6c7749c0 R15: 0000000000000000
Code: c8 48 89 f7 48 c1 ef 03 80 3c 17 00 0f 85 53 08 00 00 48 8d 78 08 48  
ba 00 00 00 00 00 fc ff df 49 89 45 38 48 89 fe 48 c1 ee 03 <0f> b6 14 16  
84 d2 74 09 80 fa 03 0f 8e 37 07 00 00 48 89 ca 44
RIP: scatterwalk_start include/crypto/scatterwalk.h:86 [inline] RSP:  
ffff8801c01ff6f0
RIP: scatterwalk_pagedone include/crypto/scatterwalk.h:111 [inline] RSP:  
ffff8801c01ff6f0
RIP: scatterwalk_done include/crypto/scatterwalk.h:119 [inline] RSP:  
ffff8801c01ff6f0
RIP: blkcipher_walk_done+0x447/0xde0 crypto/blkcipher.c:125 RSP:  
ffff8801c01ff6f0
---[ end trace b86792643e54649a ]---
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#2] SMP KASAN
Dumping ftrace buffer:
    (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 3585 Comm: syzkaller843837 Tainted: G      D           
4.14.0-mm1+ #25
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
task: ffff8801ca904240 task.stack: ffff8801cb1f8000
RIP: 0010:scatterwalk_start include/crypto/scatterwalk.h:86 [inline]
RIP: 0010:scatterwalk_pagedone include/crypto/scatterwalk.h:111 [inline]
RIP: 0010:scatterwalk_done include/crypto/scatterwalk.h:119 [inline]
RIP: 0010:blkcipher_walk_done+0x447/0xde0 crypto/blkcipher.c:125
RSP: 0018:ffff8801cb1ff6f0 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 00000000000003ef RCX: ffff8801cb1ff7e0
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000008
RBP: ffff8801cb1ff740 R08: ffffed00374e1e02 R09: 0000000000000010
R10: 0000000000000000 R11: ffffed00374e1e01 R12: ffff8801cb1ff8b8
R13: ffff8801cb1ff7a0 R14: ffff8801cb1ff7e8 R15: ffff8801cad38ad0
FS:  00007f4f6075c700(0000) GS:ffff8801db500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4f67769e78 CR3: 00000001d83fb000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
  skcipher_null_crypt+0x1da/0x2d0 crypto/crypto_null.c:91
  skcipher_crypt_blkcipher crypto/skcipher.c:619 [inline]
  skcipher_encrypt_blkcipher+0x213/0x310 crypto/skcipher.c:628
  crypto_skcipher_encrypt include/crypto/skcipher.h:445 [inline]
  crypto_aead_copy_sgl crypto/algif_aead.c:90 [inline]
  _aead_recvmsg crypto/algif_aead.c:210 [inline]
  aead_recvmsg+0x7db/0x1970 crypto/algif_aead.c:313
  aead_recvmsg_nokey+0x60/0x80 crypto/algif_aead.c:431
  sock_recvmsg_nosec net/socket.c:805 [inline]
  sock_recvmsg+0xc9/0x110 net/socket.c:812
  ___sys_recvmsg+0x29b/0x630 net/socket.c:2207
  __sys_recvmsg+0xe2/0x210 net/socket.c:2252
  SYSC_recvmsg net/socket.c:2264 [inline]
  SyS_recvmsg+0x2d/0x50 net/socket.c:2259
  entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x4463e9
RSP: 002b:00007f4f6075bdc8 EFLAGS: 00000202 ORIG_RAX: 000000000000002f
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004463e9
RDX: 0000000000002103 RSI: 0000000020709fc8 RDI: 000000000000000e
RBP: 00007ffd952b0bc0 R08: 00007f4f6075c700 R09: 00007f4f6075c700
R10: 00007f4f6075c700 R11: 0000000000000202 R12: 0000000000000000
R13: 00007ffd952b0bbf R14: 00007f4f6075c9c0 R15: 0000000000000000
Code: c8 48 89 f7 48 c1 ef 03 80 3c 17 00 0f 85 53 08 00 00 48 8d 78 08 48  
ba 00 00 00 00 00 fc ff df 49 89 45 38 48 89 fe 48 c1 ee 03 <0f> b6 14 16  
84 d2 74 09 80 fa 03 0f 8e 37 07 00 00 48 89 ca 44
RIP: scatterwalk_start include/crypto/scatterwalk.h:86 [inline] RSP:  
ffff8801cb1ff6f0
RIP: scatterwalk_pagedone include/crypto/scatterwalk.h:111 [inline] RSP:  
ffff8801cb1ff6f0
RIP: scatterwalk_done include/crypto/scatterwalk.h:119 [inline] RSP:  
ffff8801cb1ff6f0
RIP: blkcipher_walk_done+0x447/0xde0 crypto/blkcipher.c:125 RSP:  
ffff8801cb1ff6f0
---[ end trace b86792643e54649b ]---


---
This bug is generated by a dumb bot. It may contain errors.
See https://goo.gl/tpsmEJ for details.
Direct all questions to syzkaller@...glegroups.com.
Please credit me with: Reported-by: syzbot <syzkaller@...glegroups.com>

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