Hello:
This patch was applied to netdev/net.git (main)
by Jakub Kicinski <[email protected]>:
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!
--
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html
