linux-kernel - net/ipv4: warning in nf_nat_ipv4

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Date:   Wed, 8 Feb 2017 19:15:35 +0100
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Pablo Neira Ayuso <pablo@...filter.org>,
        Patrick McHardy <kaber@...sh.net>,
        Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
        "David S. Miller" <davem@...emloft.net>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        James Morris <jmorris@...ei.org>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        netfilter-devel@...r.kernel.org, coreteam@...filter.org,
        netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        Kostya Serebryany <kcc@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>,
        syzkaller <syzkaller@...glegroups.com>
Subject: net/ipv4: warning in nf_nat_ipv4_fn

Hi,

I've got the following error report while fuzzing the kernel with syzkaller.

On commit 926af6273fc683cd98cd0ce7bf0d04a02eed6742.

A reproducer and .config are attached.

WARNING: CPU: 2 PID: 26582 at
net/ipv4/netfilter/nf_nat_l3proto_ipv4.c:261
nf_nat_ipv4_fn+0x7f2/0xa50
net/ipv4/netfilter/nf_nat_l3proto_ipv4.c:261
Kernel panic - not syncing: panic_on_warn set ...

CPU: 2 PID: 26582 Comm: syz-executor2 Not tainted 4.10.0-rc7+ #126
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:15 [inline]
 dump_stack+0x292/0x398 lib/dump_stack.c:51
 panic+0x1cb/0x3a9 kernel/panic.c:179
 __warn+0x1c4/0x1e0 kernel/panic.c:539
 warn_slowpath_null+0x2c/0x40 kernel/panic.c:582
 nf_nat_ipv4_fn+0x7f2/0xa50 net/ipv4/netfilter/nf_nat_l3proto_ipv4.c:261
 nf_nat_ipv4_local_fn+0x1be/0x6d0 net/ipv4/netfilter/nf_nat_l3proto_ipv4.c:414
 iptable_nat_ipv4_local_fn+0x2c/0x40 net/ipv4/netfilter/iptable_nat.c:67
 nf_hook_entry_hookfn include/linux/netfilter.h:102 [inline]
 nf_hook_slow+0xc3/0x290 net/netfilter/core.c:310
 nf_hook include/linux/netfilter.h:212 [inline]
 NF_HOOK include/linux/netfilter.h:255 [inline]
 raw_send_hdrinc net/ipv4/raw.c:420 [inline]
 raw_sendmsg+0x2bab/0x38e0 net/ipv4/raw.c:637
 inet_sendmsg+0x164/0x5b0 net/ipv4/af_inet.c:744
 sock_sendmsg_nosec net/socket.c:635 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:645
 sock_write_iter+0x326/0x620 net/socket.c:848
 new_sync_write fs/read_write.c:499 [inline]
 __vfs_write+0x483/0x760 fs/read_write.c:512
 vfs_write+0x187/0x530 fs/read_write.c:560
 SYSC_write fs/read_write.c:607 [inline]
 SyS_write+0xfb/0x230 fs/read_write.c:599
 entry_SYSCALL_64_fastpath+0x1f/0xc2
RIP: 0033:0x4458b9
RSP: 002b:00007f0e76be1b58 EFLAGS: 00000292 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00000000004458b9
RDX: 000000000000004f RSI: 0000000020009000 RDI: 0000000000000005
RBP: 00000000006e2fd0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000292 R12: 00000000007080a8
R13: 0000000000000000 R14: 00007f0e76be29c0 R15: 00007f0e76be2700
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..

View attachment "nat-ipv4-warn-poc.c" of type "text/x-csrc" (7645 bytes)

Download attachment ".config" of type "application/octet-stream" (124975 bytes)