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drm/bridge: it6505: Move a variable assignment behind a null pointer check in receive_timing_debugfs_show()

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[ Upstream commit 0be05a75de2916421e88e0d64b001984f54df0bd ]

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: b5c84a9edc ("drm/bridge: add it6505 driver")
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Link: https://patchwork.freedesktop.org/patch/msgid/fa69384f-1485-142b-c4ee-3df54ac68a89@web.de
Reviewed-by: Robert Foss <rfoss@kernel.org>
Signed-off-by: Robert Foss <rfoss@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Markus Elfring 2023-04-16 17:30:46 +02:00 committed by Greg Kroah-Hartman
parent 9fbe61e3c2
commit 9d27705e3c
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/bridge/ite-it6505.c
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@ -3085,7 +3085,7 @@ 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;
@ -3094,6 +3094,7 @@ 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);