BUG: unable to handle kernel NULL pointer dereference at 0000000000000020 IP: __crypto_alg_lookup+0x43/0x190 crypto/api.c:63 PGD 1fa1f6067 P4D 1fa1f6067 PUD 1fd791067 PMD 0 Oops: 0000 [#1] SMP Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 1 PID: 12687 Comm: syz-executor3 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:ffffc90005ca7ca0 EFLAGS: 00010216 RAX: 0000000000010000 RBX: 0000000000000000 RCX: ffffffff816741f3 RDX: 0000000000001257 RSI: ffffc90002b67000 RDI: ffff88020c014881 RBP: ffffc90005ca7ce8 R08: 0000000000000001 R09: 0000000000000001 R10: ffffc90005ca7c68 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000001 R14: 000000000000248c R15: 0000000000000405 FS: 00007f4c87e43700(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000020 CR3: 00000001fdd6f001 CR4: 00000000001606e0 Call Trace: crypto_alg_lookup+0x31/0x50 crypto/api.c:201 crypto_larval_lookup.part.8+0x34/0x1c0 crypto/api.c:218 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 crypto_get_default_null_skcipher+0x5f/0x80 crypto/crypto_null.c:164 crypto_get_default_null_skcipher2 include/crypto/null.h:17 [inline] aead_bind+0x66/0xc0 crypto/algif_aead.c:494 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: 0033:0x452a09 RSP: 002b:00007f4c87e42c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000031 RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452a09 RDX: 0000000000000058 RSI: 0000000020f3bfa8 RDI: 0000000000000013 RBP: 00000000000002cc R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f13c0 R13: 00000000ffffffff R14: 00007f4c87e436d4 R15: 0000000000000000 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: ffffc90005ca7ca0 CR2: 0000000000000020 BUG: unable to handle kernel NULL pointer dereference at 0000000000000020 ---[ end trace de801ba1cd2521d3 ]---