Re: [PATCH] Input: ads7846 - Expand xfer array to match usage

[Kees Cook <kees@kernel.org>]

On Sun, Nov 17, 2024 at 11:06:27PM +0100, Marek Vasut wrote:
> On 11/17/24 4:34 AM, Kees Cook wrote:
> > Commit 781a07da9bb9 ("Input: ads7846 - add dummy command register
> > clearing cycle") added commands to struct ser_req::xfer without
> > expanding it to hold them. Expand the array to the correct size.
> > 
> > ../drivers/input/touchscreen/ads7846.c: In function 'ads7846_read12_ser':
> > ../drivers/input/touchscreen/ads7846.c:416:18: error: array subscript 7 is above array bounds of 'struct spi_transfer[6]' [-Werror=array-bounds=]
> >    416 |         req->xfer[7].rx_buf = &req->scratch;
> >        |         ~~~~~~~~~^~~
> > ../drivers/input/touchscreen/ads7846.c:334:33: note: while referencing 'xfer'
> >    334 |         struct spi_transfer     xfer[6];
> >        |                                 ^~~~
> > 
> > Fixes: 781a07da9bb9 ("Input: ads7846 - add dummy command register clearing cycle")
> > Signed-off-by: Kees Cook <kees@kernel.org>
> I think Nathan already sent a fix too.

Oh excellent! I did a search in lore before sending it but must have
failed to find it. Do you have a link to it?

-Kees

-- 
Kees Cook