1FILE: crypto/blkcipher.c 2 3BUG: unable to handle kernel NULL pointer dereference at 0000000000000074 4IP: virt_to_cache mm/slab.c:400 [inline] 5IP: kfree+0xb2/0x250 mm/slab.c:3802 6PGD 1c18ff067 P4D 1c18ff067 PUD 1c3556067 PMD 0 7Oops: 0000 [#1] SMP KASAN 8Dumping ftrace buffer: 9 (ftrace buffer empty) 10Modules linked in: 11CPU: 1 PID: 24672 Comm: syz-executor7 Not tainted 4.14.0+ #129 12Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS 13Google 01/01/2011 14task: ffff8801c904c540 task.stack: ffff8801a4320000 15RIP: 0010:virt_to_cache mm/slab.c:400 [inline] 16RIP: 0010:kfree+0xb2/0x250 mm/slab.c:3802 17RSP: 0018:ffff8801a4327750 EFLAGS: 00010046 18RAX: 0000000000000000 RBX: ffff8801a4327918 RCX: ffffffffffffffff 19RDX: ffffea000690c9c0 RSI: 0000000000000000 RDI: ffff8801a4327918 20RBP: ffff8801a4327770 R08: ffffed003a6e6874 R09: 0000000000000000 21R10: 0000000000000001 R11: ffffed003a6e6873 R12: 0000000000000286 22R13: 0000000000000000 R14: ffff8801a4327918 R15: ffff8801a4327880 23FS: 00007f63f74de700(0000) GS:ffff8801db500000(0000) knlGS:0000000000000000 24CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 25CR2: 0000000000000074 CR3: 00000001c6f12000 CR4: 00000000001406e0 26DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 27DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 28Call Trace: 29 blkcipher_walk_done+0x72b/0xde0 crypto/blkcipher.c:139 30