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Subject: Re: [PATCH net] 6lowpan: fix off-by-one in multicast context address
 compression
From: patchwork-bot+netdevbpf@kernel.org
Message-Id: 
 <178036740541.211970.3874244656503204922.git-patchwork-notify@kernel.org>
Date: Tue, 02 Jun 2026 02:30:05 +0000
References: <20260527081806.42747-1-zhaoyz24@mails.tsinghua.edu.cn>
In-Reply-To: <20260527081806.42747-1-zhaoyz24@mails.tsinghua.edu.cn>
To: Yizhou Zhao <zhaoyz24@mails.tsinghua.edu.cn>
Cc: netdev@vger.kernel.org, alex.aring@gmail.com, davem@davemloft.net,
 edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org,
 linux-bluetooth@vger.kernel.org, linux-wpan@vger.kernel.org,
 linux-kernel@vger.kernel.org, yangyx22@mails.tsinghua.edu.cn,
 wangao@seu.edu.cn, fengxw06@126.com, qli01@tsinghua.edu.cn,
 xuke@tsinghua.edu.cn

Hello:

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

On Wed, 27 May 2026 16:18:01 +0800 you wrote:
> The second memcpy in lowpan_iphc_mcast_ctx_addr_compress() uses
> &data[1] as destination and &ipaddr->s6_addr[11] as source, but
> both should be offset by one: &data[2] and &ipaddr->s6_addr[12]
> respectively.
> 
> This off-by-one has two consequences:
> 1. data[1] is overwritten with s6_addr[11], corrupting the RIID
>    field in the compressed multicast address
> 2. data[5] is never written, so uninitialized kernel stack memory
>    is transmitted over the network via lowpan_push_hc_data(),
>    leaking kernel stack contents
> 
> [...]

Here is the summary with links:
  - [net] 6lowpan: fix off-by-one in multicast context address compression
    https://git.kernel.org/netdev/net/c/2a58899d1100

You are awesome, thank you!
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