BUG: unable to handle kernel NULL pointer dereference at 0000000000000020 IP: __crypto_alg_lookup+0x43/0x190 crypto/api.c:63 PGD 1ddf82067 P4D 1ddf82067 PUD 215317067 PMD 0 Oops: 0000 [#1] SMP Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 1 PID: 8520 Comm: syz-executor1 Not tainted 4.15.0-rc3-next-20171214+ #67 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__crypto_alg_lookup+0x43/0x190 crypto/api.c:63 RSP: 0018:ffffc90000f33cb8 EFLAGS: 00010216 RAX: 0000000000010000 RBX: 0000000000000000 RCX: ffffffff816741f3 RDX: 0000000000000882 RSI: ffffc90003210000 RDI: ffff8801dde1e881 RBP: ffffc90000f33d00 R08: 0000000000000001 R09: 0000000000000001 R10: ffffc90000f33c80 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000001 R14: 000000000000240c R15: 0000000000000405 FS: 00007fd366987700(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000020 CR3: 00000001dfe55000 CR4: 00000000001426e0 DR0: 0000000020001000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: crypto_alg_lookup+0x31/0x50 crypto/api.c:201 crypto_larval_lookup.part.8+0xa0/0x1c0 crypto/api.c:226 crypto_larval_lookup crypto/api.c:212 [inline] crypto_alg_mod_lookup+0x77/0x120 crypto/api.c:271 crypto_find_alg crypto/api.c:501 [inline] crypto_alloc_tfm+0x67/0x180 crypto/api.c:534 crypto_alloc_skcipher+0x2c/0x40 crypto/skcipher.c:927 skcipher_bind+0x51/0x90 crypto/algif_skcipher.c:323 alg_bind+0x94/0x180 crypto/af_alg.c:179 SYSC_bind+0xa8/0x130 net/socket.c:1454 SyS_bind+0x24/0x30 net/socket.c:1440 entry_SYSCALL_64_fastpath+0x1f/0x96 RIP: 0033:0x452a39 RSP: 002b:00007fd366986c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000031 RAX: ffffffffffffffda RBX: 00000000007580d8 RCX: 0000000000452a39 RDX: 0000000000000058 RSI: 0000000020166000 RDI: 0000000000000014 RBP: 0000000000000048 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006ee760 R13: 00000000ffffffff R14: 00007fd3669876d4 R15: 0000000000000005 Code: 89 7d d0 e8 70 61 c4 ff 48 8b 1d 89 df a6 01 48 81 fb 60 21 0e 83 0f 84 4c 01 00 00 c7 45 c4 fe ff ff ff 45 31 e4 e8 4d 61 c4 ff <44> 8b 6b 20 41 f6 c5 60 0f 85 03 01 00 00 e8 3a 61 c4 ff 44 89 RIP: __crypto_alg_lookup+0x43/0x190 crypto/api.c:63 RSP: ffffc90000f33cb8 CR2: 0000000000000020 ---[ end trace 2774c7910fac223b ]---