linux-kernel - Re: [PATCH v3] net: vmxnet3: fix possible use-after-free bugs in vmxnet3_rq_alloc_rx

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Date:   Tue, 17 May 2022 10:20:11 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Zixuan Fu <r33s3n6@...il.com>
Cc:     doshir@...are.com, pv-drivers@...are.com, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        baijiaju1990@...il.com, oslab@...nghua.edu.cn
Subject: Re: [PATCH v3] net: vmxnet3: fix possible use-after-free bugs in
 vmxnet3_rq_alloc_rx_buf()

Hello:

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

On Sat, 14 May 2022 13:06:56 +0800 you wrote:
> In vmxnet3_rq_alloc_rx_buf(), when dma_map_single() fails, rbi->skb is
> freed immediately. Similarly, in another branch, when dma_map_page() fails,
> rbi->page is also freed. In the two cases, vmxnet3_rq_alloc_rx_buf()
> returns an error to its callers vmxnet3_rq_init() -> vmxnet3_rq_init_all()
> -> vmxnet3_activate_dev(). Then vmxnet3_activate_dev() calls
> vmxnet3_rq_cleanup_all() in error handling code, and rbi->skb or rbi->page
> are freed again in vmxnet3_rq_cleanup_all(), causing use-after-free bugs.
> 
> [...]

Here is the summary with links:
  - [v3] net: vmxnet3: fix possible use-after-free bugs in vmxnet3_rq_alloc_rx_buf()
    https://git.kernel.org/netdev/net/c/9e7fef9521e7

You are awesome, thank you!
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