BUG: unable to handle kernel paging request in ebt_do_table

From: syzbot
Date: Sat Jun 09 2018 - 18:47:24 EST

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Hello,

syzbot found the following crash on:

HEAD commit: 7d3bf613e99a Merge tag 'libnvdimm-for-4.18' of git://git.k..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=101c56bf800000
kernel config: https://syzkaller.appspot.com/x/.config?x=f04d8d0a2afb789a
dashboard link: https://syzkaller.appspot.com/bug?extid=93f34882275ae7caf9db
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=10bdbebf800000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14a8a0cf800000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+93f34882275ae7caf9db@xxxxxxxxxxxxxxxxxxxxxxxxx

IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready
IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready
8021q: adding VLAN 0 to HW filter on device team0
IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready
BUG: unable to handle kernel paging request at ffffc9005c3ca003
PGD 1da946067 P4D 1da946067 PUD 0
Oops: 0000 [#1] SMP KASAN
CPU: 0 PID: 4498 Comm: syz-executor667 Not tainted 4.17.0+ #92
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:ebt_do_table+0x1983/0x2140 net/bridge/netfilter/ebtables.c:288
Code: 24 08 48 89 d8 48 89 9d d0 fe ff ff 48 c1 e8 03 42 0f b6 04 38 84 c0 74 08 3c 03 0f 8e 3b 06 00 00 48 8b 85 d0 fe ff ff 31 ff <8b> 18 89 de e8 04 e8 c0 fa 85 db 0f 85 a0 02 00 00 e8 e7 e6 c0 fa
RSP: 0018:ffff8801b2e15c68 EFLAGS: 00010246
RAX: ffffc9005c3ca003 RBX: ffffc9005c3ca003 RCX: ffffc90001e1e000
RDX: 0000000000000000 RSI: ffffffff86b9558c RDI: 0000000000000000
RBP: ffff8801b2e15e38 R08: ffff8801b2588380 R09: ffffed003b5c46d6
R10: ffffed003b5c46d6 R11: ffff8801dae236b3 R12: ffffc90001e1e000
R13: ffffc90001e1a130 R14: ffffc90001e1a090 R15: dffffc0000000000
FS: 00000000006ed880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc9005c3ca003 CR3: 00000001b3ba1000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
ebt_in_hook+0x65/0x80 net/bridge/netfilter/ebtable_filter.c:63
ebt_out_hook+0x25/0x30 net/bridge/netfilter/ebtable_filter.c:63
nf_hook_entry_hookfn include/linux/netfilter.h:119 [inline]
nf_hook_slow+0xc2/0x1c0 net/netfilter/core.c:511
nf_hook include/linux/netfilter.h:242 [inline]
NF_HOOK include/linux/netfilter.h:285 [inline]
__br_forward+0x520/0xd90 net/bridge/br_forward.c:113
deliver_clone+0x61/0xc0 net/bridge/br_forward.c:129
maybe_deliver net/bridge/br_forward.c:170 [inline]
br_flood+0x6f3/0x980 net/bridge/br_forward.c:212
br_dev_xmit+0x1121/0x1810 net/bridge/br_device.c:103
__netdev_start_xmit include/linux/netdevice.h:4128 [inline]
netdev_start_xmit include/linux/netdevice.h:4137 [inline]
xmit_one net/core/dev.c:3034 [inline]
dev_hard_start_xmit+0x264/0xc10 net/core/dev.c:3050
__dev_queue_xmit+0x29da/0x3900 net/core/dev.c:3569
dev_queue_xmit+0x17/0x20 net/core/dev.c:3602
neigh_resolve_output+0x679/0xad0 net/core/neighbour.c:1361
neigh_output include/net/neighbour.h:483 [inline]
ip_finish_output2+0xa5f/0x1840 net/ipv4/ip_output.c:229
ip_do_fragment+0x218e/0x2ac0 net/ipv4/ip_output.c:675
ip_fragment.constprop.49+0x179/0x240 net/ipv4/ip_output.c:546
ip_finish_output+0x6cb/0xf80 net/ipv4/ip_output.c:315
NF_HOOK_COND include/linux/netfilter.h:276 [inline]
ip_output+0x21b/0x850 net/ipv4/ip_output.c:405
dst_output include/net/dst.h:444 [inline]
ip_local_out+0xc5/0x1b0 net/ipv4/ip_output.c:124
ip_send_skb+0x40/0xe0 net/ipv4/ip_output.c:1435
udp_send_skb.isra.39+0x6b7/0x11d0 net/ipv4/udp.c:824
udp_push_pending_frames+0x5c/0xf0 net/ipv4/udp.c:852
udp_sendmsg+0x17d1/0x3970 net/ipv4/udp.c:1152
udpv6_sendmsg+0x28c8/0x35f0 net/ipv6/udp.c:1200
inet_sendmsg+0x19f/0x690 net/ipv4/af_inet.c:798
sock_sendmsg_nosec net/socket.c:633 [inline]
sock_sendmsg+0xd5/0x120 net/socket.c:643
__sys_sendto+0x3d7/0x670 net/socket.c:1821
__do_sys_sendto net/socket.c:1833 [inline]
__se_sys_sendto net/socket.c:1829 [inline]
__x64_sys_sendto+0xe1/0x1a0 net/socket.c:1829
do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x441af9
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 6b 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffeebd76c18 EFLAGS: 00000213 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441af9
RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000004
RBP: 00000000006cd018 R08: 0000000020000180 R09: 000000000000001c
R10: 0000000000000000 R11: 0000000000000213 R12: 00000000004027f0
R13: 0000000000402880 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
Dumping ftrace buffer:
(ftrace buffer empty)
CR2: ffffc9005c3ca003
---[ end trace b04e96b1e335c4f5 ]---
RIP: 0010:ebt_do_table+0x1983/0x2140 net/bridge/netfilter/ebtables.c:288
Code: 24 08 48 89 d8 48 89 9d d0 fe ff ff 48 c1 e8 03 42 0f b6 04 38 84 c0 74 08 3c 03 0f 8e 3b 06 00 00 48 8b 85 d0 fe ff ff 31 ff <8b> 18 89 de e8 04 e8 c0 fa 85 db 0f 85 a0 02 00 00 e8 e7 e6 c0 fa
RSP: 0018:ffff8801b2e15c68 EFLAGS: 00010246
RAX: ffffc9005c3ca003 RBX: ffffc9005c3ca003 RCX: ffffc90001e1e000
RDX: 0000000000000000 RSI: ffffffff86b9558c RDI: 0000000000000000
RBP: ffff8801b2e15e38 R08: ffff8801b2588380 R09: ffffed003b5c46d6
R10: ffffed003b5c46d6 R11: ffff8801dae236b3 R12: ffffc90001e1e000
R13: ffffc90001e1a130 R14: ffffc90001e1a090 R15: dffffc0000000000
FS: 00000000006ed880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc9005c3ca003 CR3: 00000001b3ba1000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

---
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Previous message: okaya: "Re: [PATCH] staging: rts5208: add check on NULL before dereference"
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