Re: general protection fault in gcmaes_crypt_by_sg (2)

[syzbot]

syzbot has found a reproducer for the following crash on:

HEAD commit:    1d1997db Revert "nfp: abm: fix memory leak in nfp_abm_u32_..
git tree:       net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1051508ee00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=cef1fd5032faee91
dashboard link: https://syzkaller.appspot.com/bug?extid=675c45cea768b3819803
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10d635a6e00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=114489a9e00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+675c45cea768b3819803@xxxxxxxxxxxxxxxxxxxxxxxxx

kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 183 Comm: kworker/u4:3 Not tainted 5.5.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Workqueue: pencrypt_parallel padata_parallel_worker
RIP: 0010:scatterwalk_start include/crypto/scatterwalk.h:68 [inline]
RIP: 0010:scatterwalk_pagedone include/crypto/scatterwalk.h:93 [inline]
RIP: 0010:scatterwalk_done include/crypto/scatterwalk.h:101 [inline]
RIP: 0010:gcmaes_crypt_by_sg.constprop.0+0x1035/0x1aa0  
arch/x86/crypto/aesni-intel_glue.c:786
Code: e8 90 e8 52 02 48 89 84 24 a8 00 00 00 48 83 c0 08 48 89 c2 48 89 84  
24 90 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 04 02 84  
c0 74 08 3c 03 0f 8e 30 09 00 00 48 8b 84 24 a8 00
RSP: 0018:ffffc900012e7750 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000004000 RCX: ffffffff838cc029
RDX: 0000000000000001 RSI: ffffffff838cc07b RDI: 0000000000000007
RBP: ffffc900012e7b20 R08: ffff8880a8c46080 R09: 000000000000000d
R10: ffff8880a3efe660 R11: 00000000000000d0 R12: 0000000000004000
R13: 0000000000000000 R14: ffff8880a3efe300 R15: 0000000000004000
FS:  0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff220a2d90 CR3: 00000000a8d5d000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 gcmaes_encrypt arch/x86/crypto/aesni-intel_glue.c:840 [inline]
 generic_gcmaes_encrypt+0x10d/0x160 arch/x86/crypto/aesni-intel_glue.c:1019
 crypto_aead_encrypt+0xaf/0xf0 crypto/aead.c:94
 simd_aead_encrypt+0x1a6/0x2b0 crypto/simd.c:335
 crypto_aead_encrypt+0xaf/0xf0 crypto/aead.c:94
 pcrypt_aead_enc+0x19/0x80 crypto/pcrypt.c:76
 padata_parallel_worker+0x28f/0x470 kernel/padata.c:81
 process_one_work+0x9af/0x1740 kernel/workqueue.c:2264
 worker_thread+0x98/0xe40 kernel/workqueue.c:2410
 kthread+0x361/0x430 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Modules linked in:
------------[ cut here ]------------
WARNING: CPU: 1 PID: 183 at kernel/locking/mutex.c:1419  
mutex_trylock+0x279/0x2f0 kernel/locking/mutex.c:1427