netdev - Re: [PATCH] ath10k: Correct error check of dma_map_single()

Open Source and information security mailing list archives

Date:   Fri, 11 Oct 2019 10:16:52 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Kalle Valo <kvalo@...eaurora.org>
Cc:     netdev@...r.kernel.org, linux-wireless@...r.kernel.org,
        linux-kernel@...r.kernel.org, ath10k@...ts.infradead.org,
        stable@...r.kernel.org, Niklas Cassel <niklas.cassel@...aro.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH] ath10k: Correct error check of dma_map_single()

On Fri 11 Oct 04:57 PDT 2019, Kalle Valo wrote:

> Bjorn Andersson <bjorn.andersson@...aro.org> wrote:
> 
> > The return value of dma_map_single() should be checked for errors using
> > dma_mapping_error(), rather than testing for NULL. Correct this.
> > 
> > Fixes: 1807da49733e ("ath10k: wmi: add management tx by reference support over wmi")
> > Cc: stable@...r.kernel.org
> > Reported-by: Niklas Cassel <niklas.cassel@...aro.org>
> > Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> 
> Did this fix any real bug? Or is this just something found during code review?
> 

CONFIG_DMA_API_DEBUG screamed at us for calling dma_unmap_single()
without ever having called dma_mapping_error() on the return value.

But Govind just pointed out to me that I hastily missed the fact that
this code path leaks the dequeued skb. So I'll respin the patch to fix
both issues at once.

Regards,
Bjorn

> -- 
> https://patchwork.kernel.org/patch/11183923/
> 
> https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
> 
> 
> _______________________________________________
> ath10k mailing list
> ath10k@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/ath10k

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