netdev - Re: [PATCH net v3] net: fix out-of-bounds access in ops

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Message-Id: 
 <171500282791.18962.18107308487958353517.git-patchwork-notify@kernel.org>
Date: Mon, 06 May 2024 13:40:27 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Thadeu Lima de Souza Cascardo <cascardo@...lia.com>
Cc: netdev@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com,
 kuba@...nel.org, pabeni@...hat.com, kuniyu@...zon.com, kernel-dev@...lia.com,
 stable@...r.kernel.org
Subject: Re: [PATCH net v3] net: fix out-of-bounds access in ops_init

Hello:

This patch was applied to netdev/net.git (main)
by Paolo Abeni <pabeni@...hat.com>:

On Thu,  2 May 2024 10:20:06 -0300 you wrote:
> net_alloc_generic is called by net_alloc, which is called without any
> locking. It reads max_gen_ptrs, which is changed under pernet_ops_rwsem. It
> is read twice, first to allocate an array, then to set s.len, which is
> later used to limit the bounds of the array access.
> 
> It is possible that the array is allocated and another thread is
> registering a new pernet ops, increments max_gen_ptrs, which is then used
> to set s.len with a larger than allocated length for the variable array.
> 
> [...]

Here is the summary with links:
  - [net,v3] net: fix out-of-bounds access in ops_init
    https://git.kernel.org/netdev/net/c/a26ff37e624d

You are awesome, thank you!
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