netdev - Re: [PATCH V2 iproute2-next] ip: ipmaddr.c: Fix possible integer underflow in read

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Message-Id: 
 <175383181025.1684209.1251405483737540810.git-patchwork-notify@kernel.org>
Date: Tue, 29 Jul 2025 23:30:10 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Anton Moryakov <ant.v.moryakov@...il.com>
Cc: netdev@...r.kernel.org
Subject: Re: [PATCH V2 iproute2-next] ip: ipmaddr.c: Fix possible integer
 underflow in read_igmp()

Hello:

This patch was applied to iproute2/iproute2-next.git (main)
by David Ahern <dsahern@...nel.org>:

On Sun, 20 Jul 2025 18:38:43 +0300 you wrote:
> Static analyzer pointed out a potential error:
> 
> 	Possible integer underflow: left operand is tainted. An integer underflow
> 	may occur due to arithmetic operation (unsigned subtraction) between variable
> 	'len' and value '1', when 'len' is tainted { [0, 18446744073709551615] }
> 
> The fix adds a check for 'len == 0' before accessing the last character of
> the name, and skips the current line in such cases to avoid the underflow.
> 
> [...]

Here is the summary with links:
  - [V2,iproute2-next] ip: ipmaddr.c: Fix possible integer underflow in read_igmp()
    https://git.kernel.org/pub/scm/network/iproute2/iproute2-next.git/commit/?id=5734dc8aa703

You are awesome, thank you!
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