netlink: 5 bytes leftover after parsing attributes in process `syz-executor5'. BUG: sleeping function called from invalid context at arch/x86/mm/fault.c:1372 in_atomic(): 0, irqs_disabled(): 1, pid: 29068, name: syz-executor7 2 locks held by syz-executor7/29068: #0: (sk_lock-AF_ALG){+.+.}, at: [<000000002d7eb686>] lock_sock include/net/sock.h:1465 [inline] #0: (sk_lock-AF_ALG){+.+.}, at: [<000000002d7eb686>] skcipher_recvmsg+0xb3/0xf20 crypto/algif_skcipher.c:163 #1: (&mm->mmap_sem){++++}, at: [<000000005067cfcc>] __do_page_fault+0x32d/0xc90 arch/x86/mm/fault.c:1358 irq event stamp: 2228 hardirqs last enabled at (2227): [<00000000fa590525>] slab_alloc mm/slab.c:3378 [inline] hardirqs last enabled at (2227): [<00000000fa590525>] __do_kmalloc mm/slab.c:3709 [inline] hardirqs last enabled at (2227): [<00000000fa590525>] __kmalloc+0x23a/0x760 mm/slab.c:3720 hardirqs last disabled at (2228): [<00000000cb65772d>] kfree+0x6a/0x250 mm/slab.c:3800 softirqs last enabled at (2222): [<000000006d42dd5f>] lock_sock_nested+0x91/0x110 net/core/sock.c:2765 softirqs last disabled at (2220): [<00000000c425f8c1>] spin_lock_bh include/linux/spinlock.h:320 [inline] softirqs last disabled at (2220): [<00000000c425f8c1>] lock_sock_nested+0x44/0x110 net/core/sock.c:2762 CPU: 1 PID: 29068 Comm: syz-executor7 Not tainted 4.15.0-rc2+ #146 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:53 ___might_sleep+0x2b2/0x470 kernel/sched/core.c:6060 __might_sleep+0x95/0x190 kernel/sched/core.c:6013 __do_page_fault+0x350/0xc90 arch/x86/mm/fault.c:1372 do_page_fault+0xee/0x720 arch/x86/mm/fault.c:1504 page_fault+0x22/0x30 arch/x86/entry/entry_64.S:1094 RIP: 0010:virt_to_cache mm/slab.c:400 [inline] RIP: 0010:kfree+0xb2/0x250 mm/slab.c:3802 RSP: 0018:ffff8801bdf77780 EFLAGS: 00010046 RAX: 0000000000000000 RBX: ffff8801bdf77948 RCX: ffffffffffffffff RDX: ffffea0006f7ddc0 RSI: 0000000000000000 RDI: ffff8801bdf77948 RBP: ffff8801bdf777a0 R08: ffffed00380cc39c R09: 0000000000000000 R10: 0000000000000001 R11: ffffed00380cc39b R12: 0000000000000286 R13: 0000000000000000 R14: ffff8801bdf77948 R15: ffff8801bdf778b0 blkcipher_walk_done+0x72b/0xde0 crypto/blkcipher.c:139 encrypt+0x50a/0xaf0 crypto/salsa20_generic.c:208 skcipher_crypt_blkcipher crypto/skcipher.c:622 [inline] skcipher_decrypt_blkcipher+0x213/0x310 crypto/skcipher.c:640 crypto_skcipher_decrypt include/crypto/skcipher.h:463 [inline] _skcipher_recvmsg crypto/algif_skcipher.c:144 [inline] skcipher_recvmsg+0xa54/0xf20 crypto/algif_skcipher.c:165 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: 0033:0x452a39 RSP: 002b:00007f6c45132c58 EFLAGS: 00000212 ORIG_RAX: 000000000000002f RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 0000000000452a39 RDX: 0000000000000002 RSI: 0000000020b9b000 RDI: 0000000000000014 RBP: 000000000000000b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006ed1a8 R13: 00000000ffffffff R14: 00007f6c451336d4 R15: 0000000000000000 BUG: unable to handle kernel NULL pointer dereference at 000000008c797bd5 IP: virt_to_cache mm/slab.c:400 [inline] IP: kfree+0xb2/0x250 mm/slab.c:3802 PGD 1c3e2f067 P4D 1c3e2f067 PUD 1cc3f4067 PMD 0 Oops: 0000 [#1] SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 1 PID: 29068 Comm: syz-executor7 Tainted: G W 4.15.0-rc2+ #146 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: 00000000c6c006a1 task.stack: 00000000a3398dcc RIP: 0010:virt_to_cache mm/slab.c:400 [inline] RIP: 0010:kfree+0xb2/0x250 mm/slab.c:3802 RSP: 0018:ffff8801bdf77780 EFLAGS: 00010046 RAX: 0000000000000000 RBX: ffff8801bdf77948 RCX: ffffffffffffffff RDX: ffffea0006f7ddc0 RSI: 0000000000000000 RDI: ffff8801bdf77948 RBP: ffff8801bdf777a0 R08: ffffed00380cc39c R09: 0000000000000000 R10: 0000000000000001 R11: ffffed00380cc39b R12: 0000000000000286 R13: 0000000000000000 R14: ffff8801bdf77948 R15: ffff8801bdf778b0 FS: 00007f6c45133700(0000) GS:ffff8801db500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000074 CR3: 00000001c2379000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 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:622 [inline] skcipher_decrypt_blkcipher+0x213/0x310 crypto/skcipher.c:640 crypto_skcipher_decrypt include/crypto/skcipher.h:463 [inline] _skcipher_recvmsg crypto/algif_skcipher.c:144 [inline] skcipher_recvmsg+0xa54/0xf20 crypto/algif_skcipher.c:165 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: 0033:0x452a39 RSP: 002b:00007f6c45132c58 EFLAGS: 00000212 ORIG_RAX: 000000000000002f RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 0000000000452a39 RDX: 0000000000000002 RSI: 0000000020b9b000 RDI: 0000000000000014 RBP: 000000000000000b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006ed1a8 R13: 00000000ffffffff R14: 00007f6c451336d4 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 c5 74 af ff 48 89 de 4c 89 ef 4c 8b 75 08 e8 06 RIP: virt_to_cache mm/slab.c:400 [inline] RSP: ffff8801bdf77780 RIP: kfree+0xb2/0x250 mm/slab.c:3802 RSP: ffff8801bdf77780 CR2: 0000000000000074 ---[ end trace 891d99b5bedb7e34 ]---