linux-kernel - Re: [PATCH net] sctp: Fix undefined behavior in left shift operation

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Message-Id: 
 <174002103182.825980.16973479436826416109.git-patchwork-notify@kernel.org>
Date: Thu, 20 Feb 2025 03:10:31 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Yu-Chun Lin <eleanor15x@...il.com>
Cc: marcelo.leitner@...il.com, lucien.xin@...il.com, davem@...emloft.net,
 edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
 linux-sctp@...r.kernel.org, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, jserv@...s.ncku.edu.tw, visitorckw@...il.com
Subject: Re: [PATCH net] sctp: Fix undefined behavior in left shift operation

Hello:

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

On Tue, 18 Feb 2025 16:12:16 +0800 you wrote:
> According to the C11 standard (ISO/IEC 9899:2011, 6.5.7):
> "If E1 has a signed type and E1 x 2^E2 is not representable in the result
> type, the behavior is undefined."
> 
> Shifting 1 << 31 causes signed integer overflow, which leads to undefined
> behavior.
> 
> [...]

Here is the summary with links:
  - [net] sctp: Fix undefined behavior in left shift operation
    https://git.kernel.org/netdev/net/c/606572eb22c1

You are awesome, thank you!
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