Re: [PATCH resent] drm/bridge: it6505: Move a variable assignment behind a null pointer check in receive_timing_debugfs_show()

[Robert Foss]

On Fri, Apr 28, 2023 at 5:56 PM Markus Elfring <Markus.Elfring@xxxxxx> wrote:
>
> From: Markus Elfring <elfring@xxxxxxxxxxxxxxxxxxxxx>
> Date: Sun, 16 Apr 2023 17:30:46 +0200
>
> The address of a data structure member was determined before
> a corresponding null pointer check in the implementation of
> the function “receive_timing_debugfs_show”.
>
> Thus avoid the risk for undefined behaviour by moving the assignment
> for the variable “vid” behind the null pointer check.
>
> This issue was detected by using the Coccinelle software.
>
> Fixes: b5c84a9edcd418cd055becad6a22439e7c5e3bf8 ("drm/bridge: add it6505 driver")
> Signed-off-by: Markus Elfring <elfring@xxxxxxxxxxxxxxxxxxxxx>
> ---
>  drivers/gpu/drm/bridge/ite-it6505.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c
> index abaf6e23775e..45f579c365e7 100644
> --- a/drivers/gpu/drm/bridge/ite-it6505.c
> +++ b/drivers/gpu/drm/bridge/ite-it6505.c
> @@ -3207,7 +3207,7 @@ static ssize_t receive_timing_debugfs_show(struct file *file, char __user *buf,
>                                            size_t len, loff_t *ppos)
>  {
>         struct it6505 *it6505 = file->private_data;
> -       struct drm_display_mode *vid = &it6505->video_info;
> +       struct drm_display_mode *vid;
>         u8 read_buf[READ_BUFFER_SIZE];
>         u8 *str = read_buf, *end = read_buf + READ_BUFFER_SIZE;
>         ssize_t ret, count;
> @@ -3216,6 +3216,7 @@ static ssize_t receive_timing_debugfs_show(struct file *file, char __user *buf,
>                 return -ENODEV;
>
>         it6505_calc_video_info(it6505);
> +       vid = &it6505->video_info;
>         str += scnprintf(str, end - str, "---video timing---\n");
>         str += scnprintf(str, end - str, "PCLK:%d.%03dMHz\n",
>                          vid->clock / 1000, vid->clock % 1000);
> --
> 2.40.0
>

Applied to drm-misc-next.