linux-kernel - Re: [PATCH] netrom: fix double-free in nr_route

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Message-Id: 
 <176896620510.713092.169111915367029765.git-patchwork-notify@kernel.org>
Date: Wed, 21 Jan 2026 03:30:05 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Jeongjun Park <aha310510@...il.com>
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
 pabeni@...hat.com, horms@...nel.org, linux-hams@...r.kernel.org,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org, stable@...r.kernel.org,
 syzbot+999115c3bf275797dc27@...kaller.appspotmail.com
Subject: Re: [PATCH] netrom: fix double-free in nr_route_frame()

Hello:

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

On Mon, 19 Jan 2026 15:33:59 +0900 you wrote:
> In nr_route_frame(), old_skb is immediately freed without checking if
> nr_neigh->ax25 pointer is NULL. Therefore, if nr_neigh->ax25 is NULL,
> the caller function will free old_skb again, causing a double-free bug.
> 
> Therefore, to prevent this, we need to modify it to check whether
> nr_neigh->ax25 is NULL before freeing old_skb.
> 
> [...]

Here is the summary with links:
  - netrom: fix double-free in nr_route_frame()
    https://git.kernel.org/netdev/net/c/ba1096c31528

You are awesome, thank you!
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