On Thu, Feb 9, 2017 at 4:28 AM, Andrey Konovalov <andreyk...@google.com> wrote: > Hi, > > I've got the following error report while fuzzing the kernel with syzkaller. > > On commit 926af6273fc683cd98cd0ce7bf0d04a02eed6742. > > A reproducer and .config are attached. > > BUG: unable to handle kernel NULL pointer dereference at (null) > IP: sk_memory_allocated_sub include/net/sock.h:1214 [inline] > IP: __sk_mem_reduce_allocated+0xa9/0x390 net/core/sock.c:2215 > PGD 3aa86067 > PUD 33243067 > PMD 0 > > Oops: 0002 [#1] SMP KASAN > Dumping ftrace buffer: > (ftrace buffer empty) > Modules linked in: > CPU: 3 PID: 13215 Comm: syz-executor5 Not tainted 4.10.0-rc7+ #126 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 > task: ffff88006bf59700 task.stack: ffff88005e0a8000 > RIP: 0010:sk_memory_allocated_sub include/net/sock.h:1214 [inline] > RIP: 0010:__sk_mem_reduce_allocated+0xa9/0x390 net/core/sock.c:2215 > RSP: 0018:ffff88005e0afa48 EFLAGS: 00010246 > RAX: 0000000000000000 RBX: 1ffff1000bc15f4a RCX: 1ffffffff0bc7d8e > RDX: dffffc0000000000 RSI: ffffffff83343399 RDI: ffffffff85e3ec70 > RBP: ffff88005e0afad8 R08: 0000000000000090 R09: 0000000000000000 > R10: 0000000000000002 R11: 0000000000000000 R12: ffff88003dfb3c40 > R13: 000000000003dfb4 R14: ffff88003dfb3c68 R15: ffffffff85e3eba0 > FS: 00007f71b9ba9700(0000) GS:ffff88006df00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000000000000000 CR3: 00000000393b8000 CR4: 00000000000006e0 > Call Trace: > udp_rmem_release+0x14f/0x180 net/ipv4/udp.c:1199 > first_packet_length+0x215/0x6e0 net/ipv4/udp.c:1380 > udp_ioctl+0x13f/0x2c0 net/ipv4/udp.c:1401 > inet6_ioctl+0x19e/0x1e0 net/ipv6/af_inet6.c:530 > sock_do_ioctl+0x65/0xb0 net/socket.c:897 > sock_ioctl+0x28f/0x440 net/socket.c:995 > vfs_ioctl fs/ioctl.c:43 [inline] > do_vfs_ioctl+0x1bf/0x1780 fs/ioctl.c:683 > SYSC_ioctl fs/ioctl.c:698 [inline] > SyS_ioctl+0x8f/0xc0 fs/ioctl.c:689 > entry_SYSCALL_64_fastpath+0x1f/0xc2 > RIP: 0033:0x4458b9 > RSP: 002b:00007f71b9ba8b58 EFLAGS: 00000286 ORIG_RAX: 0000000000000010 > RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00000000004458b9 > RDX: 0000000020005f3e RSI: 000000000000541b RDI: 0000000000000005 > RBP: 00000000006e0cc0 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000286 R12: 00000000007080a8 > R13: 0000000000000000 R14: 00007f71b9ba99c0 R15: 00007f71b9ba9700 > Code: 24 28 48 ba 00 00 00 00 00 fc ff df 49 8d bf d0 00 00 00 48 89 > f9 48 c1 e9 03 80 3c 11 00 0f 85 8b 02 00 00 49 8b 87 d0 00 00 00 <f0> > 4c 29 28 4d 8b 7c 24 28 48 ba 00 00 00 00 00 fc ff df 49 8d > RIP: sk_memory_allocated_sub include/net/sock.h:1214 [inline] RSP: > ffff88005e0afa48 > RIP: __sk_mem_reduce_allocated+0xa9/0x390 net/core/sock.c:2215 RSP: > ffff88005e0afa48 > CR2: 0000000000000000 > ---[ end trace 8b75e9ae315695b0 ]--- > Kernel panic - not syncing: Fatal exception in interrupt > Dumping ftrace buffer: > (ftrace buffer empty) > Kernel Offset: disabled > Rebooting in 86400 seconds..
Thanks for the report. L2TP needs a patch that will follow shortly.
