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From: Hans Verkuil <hverkuil@xs4all.nl>
To: Linux Media Mailing List <linux-media@vger.kernel.org>
Cc: "Niklas Söderlund" <niklas.soderlund@ragnatech.se>,
	"Janusz Krzysztofik" <jmkrzyszt@gmail.com>,
	"Sakari Ailus" <sakari.ailus@linux.intel.com>
Subject: [PATCHv2 for v5.3] v4l2-subdev: fix regression in check_pad()
Date: Sat, 29 Jun 2019 15:00:10 +0200	[thread overview]
Message-ID: <9885852d-d77e-7bfe-80d4-c4ff20443529@xs4all.nl> (raw)

sd->entity.graph_obj.mdev can be NULL when this function is called, and
that breaks existing drivers (rcar-vin, but probably others as well).

Check if sd->entity.num_pads is non-zero instead since that doesn't depend
on mdev.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Reported-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Fixes: a8fa55078a77 ("media: v4l2-subdev: Verify arguments in v4l2_subdev_call()")
Tested-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
---
Changes in v2:

- Don't change the coding style, just fix the bug.
---
diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index 21fb90d66bfc..25c73c13cc7e 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -124,7 +124,7 @@ static inline int check_which(__u32 which)
 static inline int check_pad(struct v4l2_subdev *sd, __u32 pad)
 {
 #if defined(CONFIG_MEDIA_CONTROLLER)
-	if (sd->entity.graph_obj.mdev) {
+	if (sd->entity.num_pads) {
 		if (pad >= sd->entity.num_pads)
 			return -EINVAL;
 		return 0;

             reply	other threads:[~2019-06-29 13:00 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-29 13:00 Hans Verkuil [this message]
2019-07-02 12:15 ` Geert Uytterhoeven

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