============================= WARNING: suspicious RCU usage 4.14.0-next-20171124+ #51 Not tainted ----------------------------- netlink: 8 bytes leftover after parsing attributes in process `syz-executor4'. BUG: unable to handle kernel NULL pointer dereference at 0000000000000074 IP: virt_to_cache mm/slab.c:400 [inline] IP: kfree+0xb2/0x250 mm/slab.c:3803 PGD 1cbc42067 P4D 1cbc42067 PUD 1cc446067 PMD 0 Oops: 0000 [#1] SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 1 PID: 7823 Comm: syz-executor2 Not tainted 4.14.0-next-20171124+ #51 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801cbb501c0 task.stack: ffff8801c2260000 RIP: 0010:virt_to_cache mm/slab.c:400 [inline] RIP: 0010:kfree+0xb2/0x250 mm/slab.c:3803 RSP: 0018:ffff8801c22674d0 EFLAGS: 00010046 RAX: 0000000000000000 RBX: ffff8801c2267698 RCX: ffffffffffffffff RDX: ffffea00070899c0 RSI: 0000000000000000 RDI: ffff8801c2267698 RBP: ffff8801c22674f0 R08: ffffed003afeffbc R09: 0000000000000000 R10: 0000000000000001 R11: ffffed003afeffbb R12: 0000000000000286 R13: 0000000000000000 R14: ffff8801c2267698 R15: ffff8801c2267600 FS: 00007f4e7c91e700(0000) GS:ffff8801db500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000074 CR3: 00000001d3599000 CR4: 00000000001426e0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: blkcipher_walk_done+0x72b/0xde0 crypto/blkcipher.c:139 encrypt+0x50a/0xaf0 crypto/salsa20_generic.c:208 skcipher_crypt_blkcipher crypto/skcipher.c:619 [inline] skcipher_decrypt_blkcipher+0x213/0x310 crypto/skcipher.c:637 crypto_skcipher_decrypt include/crypto/skcipher.h:463 [inline] _skcipher_recvmsg crypto/algif_skcipher.c:125 [inline] skcipher_recvmsg+0xb3d/0xf30 crypto/algif_skcipher.c:164 skcipher_recvmsg_nokey+0x60/0x80 crypto/algif_skcipher.c:283 sock_recvmsg_nosec net/socket.c:805 [inline] sock_recvmsg+0xc9/0x110 net/socket.c:812 sock_read_iter+0x361/0x560 net/socket.c:889 call_read_iter include/linux/fs.h:1766 [inline] aio_read+0x2b0/0x3a0 fs/aio.c:1501 io_submit_one fs/aio.c:1611 [inline] do_io_submit+0xf99/0x14f0 fs/aio.c:1682 SYSC_io_submit fs/aio.c:1707 [inline] SyS_io_submit+0x27/0x30 fs/aio.c:1704 do_syscall_64+0x26c/0x920 arch/x86/entry/common.c:285 entry_SYSCALL64_slow_path+0x25/0x25 RIP: 0033:0x452879 RSP: 002b:00007f4e7c91dbe8 EFLAGS: 00000212 ORIG_RAX: 00000000000000d1 RAX: ffffffffffffffda RBX: 0000000000758190 RCX: 0000000000452879 RDX: 00000000201f5ff8 RSI: 0000000000000001 RDI: 00007f4e7c940000 RBP: 0000000000000159 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006ef0f8 R13: 00000000ffffffff R14: 00007f4e7c91e6d4 R15: 0000000000000002 Code: c2 48 b8 00 00 00 00 00 ea ff ff 48 89 df 48 c1 ea 0c 48 c1 e2 06 48 01 c2 48 8b 42 20 48 8d 48 ff a8 01 48 0f 45 d1 4c 8b 6a 30 <49> 63 75 74 e8 a5 59 af ff 48 89 de 4c 89 ef 4c 8b 75 08 e8 76 RIP: virt_to_cache mm/slab.c:400 [inline] RSP: ffff8801c22674d0 RIP: kfree+0xb2/0x250 mm/slab.c:3803 RSP: ffff8801c22674d0 CR2: 0000000000000074 ---[ end trace 5fe7d08a4c144ec7 ]---