Re: [PATCH v3 2/4] media: imx-jpeg: Cleanup after an allocation error

[Frank Li]

On Tue, Apr 08, 2025 at 10:57:18AM +0800, ming.qian@xxxxxxxxxxx wrote:
> From: Ming Qian <ming.qian@xxxxxxxxxxx>
>
> When allocation failures are not cleaned up by the driver, further
> allocation errors will be false-positives, which will cause buffers to
> remain uninitialized and cause NULL pointer dereferences.
...
> Clean up the errors accordingly.

Ensure proper cleanup of failed allocations to prevent these issues.

>
> Fixes: 2db16c6ed72c ("media: imx-jpeg: Add V4L2 driver for i.MX8 JPEG Encoder/Decoder")
> Signed-off-by: Ming Qian <ming.qian@xxxxxxxxxxx>
> Reviewed-by: Frank Li <Frank.Li@xxxxxxx>
> ---
> v3
> - Split the moving of code into a separate patch
>
> v2
> - Add the Fixes tag
>
>  drivers/media/platform/nxp/imx-jpeg/mxc-jpeg.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/media/platform/nxp/imx-jpeg/mxc-jpeg.c b/drivers/media/platform/nxp/imx-jpeg/mxc-jpeg.c
> index b2f7e9ad1885..12661c177f5a 100644
> --- a/drivers/media/platform/nxp/imx-jpeg/mxc-jpeg.c
> +++ b/drivers/media/platform/nxp/imx-jpeg/mxc-jpeg.c
> @@ -820,6 +820,7 @@ static bool mxc_jpeg_alloc_slot_data(struct mxc_jpeg_dev *jpeg)
>  	return true;
>  err:
>  	dev_err(jpeg->dev, "Could not allocate descriptors for slot %d", jpeg->slot_data.slot);
> +	mxc_jpeg_free_slot_data(jpeg);
>
>  	return false;
>  }
> --
> 2.43.0-rc1
>