linux-kernel - Re: [PATCH] caif: fix integer underflow in cffrml

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Message-Id: 
 <176544601627.1308621.3200906619222938174.git-patchwork-notify@kernel.org>
Date: Thu, 11 Dec 2025 09:40:16 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Junrui Luo <moonafterrain@...look.com>
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
 pabeni@...hat.com, horms@...nel.org, sjur.brandeland@...ricsson.com,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org, danisjiang@...il.com
Subject: Re: [PATCH] caif: fix integer underflow in cffrml_receive()

Hello:

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

On Thu, 04 Dec 2025 21:30:47 +0800 you wrote:
> The cffrml_receive() function extracts a length field from the packet
> header and, when FCS is disabled, subtracts 2 from this length without
> validating that len >= 2.
> 
> If an attacker sends a malicious packet with a length field of 0 or 1
> to an interface with FCS disabled, the subtraction causes an integer
> underflow.
> 
> [...]

Here is the summary with links:
  - caif: fix integer underflow in cffrml_receive()
    https://git.kernel.org/netdev/net/c/8a11ff0948b5

You are awesome, thank you!
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