netdev - Re: [PATCH net] net/xfrm: fix out-of-bounds packet access

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Date:   Fri, 12 Oct 2018 12:09:47 +0200
From:   Steffen Klassert <steffen.klassert@...unet.com>
To:     Alexei Starovoitov <ast@...nel.org>
CC:     "David S . Miller" <davem@...emloft.net>, <daniel@...earbox.net>,
        <edumazet@...gle.com>, <netdev@...r.kernel.org>,
        <kernel-team@...com>
Subject: Re: [PATCH net] net/xfrm: fix out-of-bounds packet access

On Tue, Oct 09, 2018 at 09:59:36AM -0700, Alexei Starovoitov wrote:
> BUG: KASAN: slab-out-of-bounds in _decode_session6+0x1331/0x14e0
> net/ipv6/xfrm6_policy.c:161
> Read of size 1 at addr ffff8801d882eec7 by task syz-executor1/6667
> Call Trace:
>   __dump_stack lib/dump_stack.c:77 [inline]
>   dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113
>   print_address_description+0x6c/0x20b mm/kasan/report.c:256
>   kasan_report_error mm/kasan/report.c:354 [inline]
>   kasan_report.cold.7+0x242/0x30d mm/kasan/report.c:412
>   __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:430
>   _decode_session6+0x1331/0x14e0 net/ipv6/xfrm6_policy.c:161
>   __xfrm_decode_session+0x71/0x140 net/xfrm/xfrm_policy.c:2299
>   xfrm_decode_session include/net/xfrm.h:1232 [inline]
>   vti6_tnl_xmit+0x3c3/0x1bc1 net/ipv6/ip6_vti.c:542
>   __netdev_start_xmit include/linux/netdevice.h:4313 [inline]
>   netdev_start_xmit include/linux/netdevice.h:4322 [inline]
>   xmit_one net/core/dev.c:3217 [inline]
>   dev_hard_start_xmit+0x272/0xc10 net/core/dev.c:3233
>   __dev_queue_xmit+0x2ab2/0x3870 net/core/dev.c:3803
>   dev_queue_xmit+0x17/0x20 net/core/dev.c:3836
> 
> Reported-by: syzbot+acffccec848dc13fe459@...kaller.appspotmail.com
> Reported-by: Eric Dumazet <edumazet@...gle.com>
> Signed-off-by: Alexei Starovoitov <ast@...nel.org>

This looks good, applied to the ipsec tree.
Thanks Alexei!