This is a note to let you know that I've just added the patch titled
drm/bridge: it6505: Move a variable assignment behind a null pointer check in receive_timing_debugfs_show()
to the 6.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-bridge-it6505-move-a-variable-assignment-behind-.patch
and it can be found in the queue-6.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 0ee72fad8406124bfe7426add1674f5994034dba
Author: Markus Elfring <elfring@xxxxxxxxxxxxxxxxxxxxx>
Date: Sun Apr 16 17:30:46 2023 +0200
drm/bridge: it6505: Move a variable assignment behind a null pointer check in receive_timing_debugfs_show()
[ 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: b5c84a9edcd4 ("drm/bridge: add it6505 driver")
Signed-off-by: Markus Elfring <elfring@xxxxxxxxxxxxxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/fa69384f-1485-142b-c4ee-3df54ac68a89@xxxxxx
Reviewed-by: Robert Foss <rfoss@xxxxxxxxxx>
Signed-off-by: Robert Foss <rfoss@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c
index abaf6e23775eb..45f579c365e7f 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);
