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From: patchwork-bot+netdevbpf@kernel.org
To: Shihuang Liu <shlomojune6@gmail.com>
Cc: netdev@vger.kernel.org, davem@davemloft.net, edumazet@google.com,
	kuba@kernel.org, pabeni@redhat.com, horms@kernel.org
Subject: Re: [PATCH net v2] net: skbuff: fix pull-bound underflow in skb_checksum_setup_ipv6()
Date: Thu, 24 Sep 2026 00:50:05 +0000	[thread overview]
Message-ID: <179021100565.1255052.296687664460919785.git-patchwork-notify@kernel.org> (raw)
In-Reply-To: <20260919133604.50948-1-shlomojune6@gmail.com>

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@kernel.org>:

On Sat, 19 Sep 2026 21:36:04 +0800 you wrote:
> skb_maybe_pull_tail() subtracts skb_headlen(skb) from the unsigned max
> argument and passes the result to __pskb_pull_tail() as a signed int.  The
> function does not ensure that max is at least skb_headlen(skb).
> 
> This can happen while parsing IPv6 extension headers when an skb already
> has a linear area larger than MAX_IPV6_HDR_LEN.  Once the parser needs data
> beyond the linear area, max - skb_headlen(skb) wraps and is converted to a
> negative delta.  __pskb_pull_tail() then passes that negative length to
> skb_copy_bits(), where it can become a very large copy length.
> 
> [...]

Here is the summary with links:
  - [net,v2] net: skbuff: fix pull-bound underflow in skb_checksum_setup_ipv6()
    https://git.kernel.org/netdev/net/c/3b4e0b0c008a

You are awesome, thank you!
-- 
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html



      parent reply	other threads:[~2026-09-24  0:51 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-09-19 13:36 [PATCH net v2] net: skbuff: fix pull-bound underflow in skb_checksum_setup_ipv6() Shihuang Liu
2026-09-22 12:37 ` netdev-bot+sashiko
2026-09-24  0:50 ` patchwork-bot+netdevbpf [this message]

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