netdev - Re: [PATCH v3] net: vmxnet3: fix possible NULL pointer dereference in vmxnet3_rq

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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 NULL pointer dereference in
 vmxnet3_rq_cleanup()

Hello:

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

On Sat, 14 May 2022 13:07:11 +0800 you wrote:
> In vmxnet3_rq_create(), when dma_alloc_coherent() fails,
> vmxnet3_rq_destroy() is called. It sets rq->rx_ring[i].base to NULL. Then
> vmxnet3_rq_create() returns an error to its callers mxnet3_rq_create_all()
> -> vmxnet3_change_mtu(). Then vmxnet3_change_mtu() calls
> vmxnet3_force_close() -> dev_close() in error handling code. And the driver
> calls vmxnet3_close() -> vmxnet3_quiesce_dev() -> vmxnet3_rq_cleanup_all()
> -> vmxnet3_rq_cleanup(). In vmxnet3_rq_cleanup(),
> rq->rx_ring[ring_idx].base is accessed, but this variable is NULL, causing
> a NULL pointer dereference.
> 
> [...]

Here is the summary with links:
  - [v3] net: vmxnet3: fix possible NULL pointer dereference in vmxnet3_rq_cleanup()
    https://git.kernel.org/netdev/net/c/edf410cb74dc

You are awesome, thank you!
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