linux-kernel - Re: [PATCH] media: stm32: dcmipp: correct error handling in, dcmipp_create

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Message-ID: <20240705101544.GA3926404@gnbcxd0016.gnb.st.com>
Date: Fri, 5 Jul 2024 12:15:44 +0200
From: Alain Volmat <alain.volmat@...s.st.com>
To: Hans Verkuil <hverkuil-cisco@...all.nl>
CC: Linux Media Mailing List <linux-media@...r.kernel.org>,
        Maxime Coquelin
	<mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Hugues Fruchet
	<hugues.fruchet@...com>,
        Linux Stable <stable@...r.kernel.org>,
        "linux-stm32@...md-mailman.stormreply.com"
	<linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] media: stm32: dcmipp: correct error handling in,
 dcmipp_create_subdevs

Hi Hans,

On Wed, Jul 03, 2024 at 01:59:16PM +0200, Hans Verkuil wrote:
> From: Alain Volmat <alain.volmat@...s.st.com>
> 
> Correct error handling within the dcmipp_create_subdevs by properly
> decrementing the i counter when releasing the subdevs.
> 
> Fixes: 28e0f3772296 ("media: stm32-dcmipp: STM32 DCMIPP camera interface driver")
> Cc: stable@...r.kernel.org
> Signed-off-by: Alain Volmat <alain.volmat@...s.st.com>
> Signed-off-by: Hans Verkuil <hverkuil-cisco@...all.nl>
> [hverkuil: correct the indices: it's [i], not [i - 1].]
> ---
> The original patch would cause a crash due to the incorrect indices in the
> statement after the while. Since 'i' can now become 0, so i - 1 would be a
> negative index access, which was obviously not the intention.
> 
> I reverted the patch once I noticed this (better to hang in an infinite
> loop than to crash), but I want to get a proper fix in. Rather than
> waiting for that, I decided to just take the original patch from Alain, with
> just the indices fixed.

sorry for the delay and this error within the patch.

Thanks a lot Hans and Sakari for noticing it and fixing it.

Alain

> ---
>  drivers/media/platform/st/stm32/stm32-dcmipp/dcmipp-core.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/platform/st/stm32/stm32-dcmipp/dcmipp-core.c b/drivers/media/platform/st/stm32/stm32-dcmipp/dcmipp-core.c
> index 4acc3b90d03a..7f771ea49b78 100644
> --- a/drivers/media/platform/st/stm32/stm32-dcmipp/dcmipp-core.c
> +++ b/drivers/media/platform/st/stm32/stm32-dcmipp/dcmipp-core.c
> @@ -202,8 +202,8 @@ static int dcmipp_create_subdevs(struct dcmipp_device *dcmipp)
>  	return 0;
> 
>  err_init_entity:
> -	while (i > 0)
> -		dcmipp->pipe_cfg->ents[i - 1].release(dcmipp->entity[i - 1]);
> +	while (i-- > 0)
> +		dcmipp->pipe_cfg->ents[i].release(dcmipp->entity[i]);
>  	return ret;
>  }
> 
> -- 
> 2.43.0
>