Re: [PATCH] mmc: sh_mmcif: Add check for NULL for host->chan_yx and host->chan_rx in sh_mmcif_end_cmd

[Wolfram Sang]

On Thu, Nov 17, 2022 at 03:30:07PM +0300, Anastasia Belova wrote:
> Without these checks NULL-pointer may be dereferenced in
> sh_mmcif_end_cmd parameters inside if (data->flags & MMC_DATA_READ).
> 
> Found by Linux Verification Center (linuxtesting.org) with SVACE.

Is there a code path actually triggering it? I wonder because it seems
to me the check for valid channels is already done a little above when
DMA is started. And I'd assume once DMA has been started we can take for
granted that we have a valid channel when unmapping. But maybe I am
missing some error codepath?

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