From: bo cao <treebacker@foxmail.com>
To: netdev-bot+sinfo@kernel.org
Cc: davem@davemloft.net, dsahern@kernel.org, edumazet@kernel.org,
horms@kernel.org, idosch@nvidia.com, kuba@kernel.org,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
pabeni@redhat.com, stable@vger.kernel.org
Subject: Re: [PATCH net v3] ipv6: fix dead half of the MTU guard in __ip6_append_data()
Date: Fri, 30 Oct 2026 16:57:54 +0800 [thread overview]
Message-ID: <tencent_6A5598482B26558B29AEBAA9D2EBDAE04505@qq.com> (raw)
In-Reply-To: <179335042941.3327.2302494904520671268@kernel.org>
The issue was found during an LLM-assisted source audit of the IPv6
fragmentation path (manual code inspection with an LLM's help, not a
production hit or a syzbot report).
It was then verified at runtime with a standalone reproducer: a
single sendmsg() on a raw IPv6 socket with a 1240-byte HOPOPTS cmsg
and IPV6_MTU set to fragheaderlen + 1 triggers the skb_over_panic()
described in the commit message (tested on 6.x, MSG_MORE on a device
without NETIF_F_SG). The xfrm transport-mode variant from the v2
discussion was identified the same way, by inspection of the
ip6_append_data_mtu() recompute path.
bo cao
prev parent reply other threads:[~2026-10-30 8:58 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-30 8:48 bo cao
2026-10-30 8:53 ` netdev-bot+sinfo
2026-10-30 8:57 ` bo cao [this message]
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