This is a note to let you know that I've just added the patch titled
media: v4l2-cci: Always assign *val
to the 6.6-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:
media-v4l2-cci-always-assign-val.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit a7e02b1236f40577853ec9562074d9b77fd5d500
Author: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
Date: Tue May 28 14:00:51 2024 +0300
media: v4l2-cci: Always assign *val
[ Upstream commit 7417b1b1f36cc214dc458e717278a27a912d3b51 ]
Always assign *val to 0 in cci_read(). This has the benefit of not
requiring initialisation of the variables data is read to using
cci_read(). Once smatch is fixed, it could catch the use of uninitialised
reads.
Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
Tested-by: Benjamin Mugnier <benjamin.mugnier@xxxxxxxxxxx>
Reviewed-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/media/v4l2-core/v4l2-cci.c b/drivers/media/v4l2-core/v4l2-cci.c
index ee3475bed37f..1ff94affbaf3 100644
--- a/drivers/media/v4l2-core/v4l2-cci.c
+++ b/drivers/media/v4l2-core/v4l2-cci.c
@@ -23,6 +23,15 @@ int cci_read(struct regmap *map, u32 reg, u64 *val, int *err)
u8 buf[8];
int ret;
+ /*
+ * TODO: Fix smatch. Assign *val to 0 here in order to avoid
+ * failing a smatch check on caller when the caller proceeds to
+ * read *val without initialising it on caller's side. *val is set
+ * to a valid value whenever this function returns 0 but smatch
+ * can't figure that out currently.
+ */
+ *val = 0;
+
if (err && *err)
return *err;
