============================= WARNING: suspicious RCU usage nla_parse: 8 callbacks suppressed netlink: 5 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 5 bytes leftover after parsing attributes in process `syz-executor2'. 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:3802 PGD 1d8370067 P4D 1d8370067 PUD 1c50c3067 PMD 0 Oops: 0000 [#1] SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 0 PID: 5677 Comm: syz-executor1 Not tainted 4.14.0+ #194 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801cea48180 task.stack: ffff8801d72f0000 RIP: 0010:virt_to_cache mm/slab.c:400 [inline] RIP: 0010:kfree+0xb2/0x250 mm/slab.c:3802 RSP: 0018:ffff8801d72f7750 EFLAGS: 00010046 RAX: 0000000000000000 RBX: ffff8801d72f7918 RCX: ffffffffffffffff RDX: ffffea00075cbdc0 RSI: 0000000000000000 RDI: ffff8801d72f7918 RBP: ffff8801d72f7770 R08: ffffed003b2586c4 R09: 0000000000000000 R10: 0000000000000001 R11: ffffed003b2586c3 R12: 0000000000000286 R13: 0000000000000000 R14: ffff8801d72f7918 R15: ffff8801d72f7880 FS: 00007fcc1144a700(0000) GS:ffff8801db400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000074 CR3: 00000001d7f49000 CR4: 00000000001426f0 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_encrypt_blkcipher+0x213/0x310 crypto/skcipher.c:628 crypto_skcipher_encrypt include/crypto/skcipher.h:445 [inline] _skcipher_recvmsg crypto/algif_skcipher.c:133 [inline] skcipher_recvmsg+0xa44/0xf30 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 ___sys_recvmsg+0x29b/0x630 net/socket.c:2207 __sys_recvmsg+0xe2/0x210 net/socket.c:2252 SYSC_recvmsg net/socket.c:2264 [inline] SyS_recvmsg+0x2d/0x50 net/socket.c:2259 entry_SYSCALL_64_fastpath+0x1f/0x96 RIP: 0033:0x452879 RSP: 002b:00007fcc11449be8 EFLAGS: 00000212 ORIG_RAX: 000000000000002f RAX: ffffffffffffffda RBX: 0000000000758190 RCX: 0000000000452879 RDX: 0000000000000002 RSI: 000000002022efc8 RDI: 0000000000000018 RBP: 0000000000000086 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006eda00 R13: 00000000ffffffff R14: 00007fcc1144a6d4 R15: 0000000000000000 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 f5 76 af ff 48 89 de 4c 89 ef 4c 8b 75 08 e8 06 RIP: virt_to_cache mm/slab.c:400 [inline] RSP: ffff8801d72f7750 RIP: kfree+0xb2/0x250 mm/slab.c:3802 RSP: ffff8801d72f7750 CR2: 0000000000000074 ---[ end trace a38a00ee1ea4d14e ]---