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Date:   Thu, 14 Jan 2021 03:40:08 +0000
To:     Cristian Dumitrescu <>
Subject: Re: [PATCH net] i40e: fix potential NULL pointer dereferencing


This patch was applied to netdev/net.git (refs/heads/master):

On Mon, 11 Jan 2021 18:11:38 +0000 you wrote:
> Currently, the function i40e_construct_skb_zc only frees the input xdp
> buffer when the output skb is successfully built. On error, the
> function i40e_clean_rx_irq_zc does not commit anything for the current
> packet descriptor and simply exits the packet descriptor processing
> loop, with the plan to restart the processing of this descriptor on
> the next invocation. Therefore, on error the ring next-to-clean
> pointer should not advance, the xdp i.e. *bi buffer should not be
> freed and the current buffer info should not be invalidated by setting
> *bi to NULL. Therefore, the *bi should only be set to NULL when the
> function i40e_construct_skb_zc is successful, otherwise a NULL *bi
> will be dereferenced when the work for the current descriptor is
> eventually restarted.
> [...]

Here is the summary with links:
  - [net] i40e: fix potential NULL pointer dereferencing

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