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From:   Janusz Krzysztofik <jmkrzyszt@gmail.com>
To:     Mauro Carvalho Chehab <mchehab@kernel.org>
Cc:     Sakari Ailus <sakari.ailus@linux.intel.com>,
        Hans Verkuil <hverkuil-cisco@xs4all.nl>,
        linux-media@vger.kernel.org, linux-kernel@vger.kernel.org,
        Janusz Krzysztofik <jmkrzyszt@gmail.com>
Subject: [PATCH v7 2/3] media: v4l2-subdev: Verify v4l2_subdev_call() pointer arguments
Date:   Mon, 20 May 2019 23:27:46 +0200
Message-Id: <20190520212747.368-3-jmkrzyszt@gmail.com>
In-Reply-To: <20190520212747.368-1-jmkrzyszt@gmail.com>
References: <20190520212747.368-1-jmkrzyszt@gmail.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Parameters passed to check helpers are now obtained by dereferencing
unverified pointer arguments.  Check validity of those pointers first.

Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
---
 drivers/media/v4l2-core/v4l2-subdev.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index 59fdc0f08870..957c8e5cdfe1 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -147,6 +147,9 @@ static inline int check_pad(struct v4l2_subdev *sd, __u32 pad)
 static inline int check_format(struct v4l2_subdev *sd,
 			       struct v4l2_subdev_format *format)
 {
+	if (!format)
+		return -EINVAL;
+
 	return check_which(format->which) ? : check_pad(sd, format->pad);
 }
 
@@ -170,6 +173,9 @@ static int call_enum_mbus_code(struct v4l2_subdev *sd,
 			       struct v4l2_subdev_pad_config *cfg,
 			       struct v4l2_subdev_mbus_code_enum *code)
 {
+	if (!code)
+		return -EINVAL;
+
 	return check_which(code->which) ? : check_pad(sd, code->pad) ? :
 	       sd->ops->pad->enum_mbus_code(sd, cfg, code);
 }
@@ -178,6 +184,9 @@ static int call_enum_frame_size(struct v4l2_subdev *sd,
 				struct v4l2_subdev_pad_config *cfg,
 				struct v4l2_subdev_frame_size_enum *fse)
 {
+	if (!fse)
+		return -EINVAL;
+
 	return check_which(fse->which) ? : check_pad(sd, fse->pad) ? :
 	       sd->ops->pad->enum_frame_size(sd, cfg, fse);
 }
@@ -185,6 +194,9 @@ static int call_enum_frame_size(struct v4l2_subdev *sd,
 static inline int check_frame_interval(struct v4l2_subdev *sd,
 				       struct v4l2_subdev_frame_interval *fi)
 {
+	if (!fi)
+		return -EINVAL;
+
 	return check_pad(sd, fi->pad);
 }
 
@@ -206,6 +218,9 @@ static int call_enum_frame_interval(struct v4l2_subdev *sd,
 				    struct v4l2_subdev_pad_config *cfg,
 				    struct v4l2_subdev_frame_interval_enum *fie)
 {
+	if (!fie)
+		return -EINVAL;
+
 	return check_which(fie->which) ? : check_pad(sd, fie->pad) ? :
 	       sd->ops->pad->enum_frame_interval(sd, cfg, fie);
 }
@@ -213,6 +228,9 @@ static int call_enum_frame_interval(struct v4l2_subdev *sd,
 static inline int check_selection(struct v4l2_subdev *sd,
 				  struct v4l2_subdev_selection *sel)
 {
+	if (!sel)
+		return -EINVAL;
+
 	return check_which(sel->which) ? : check_pad(sd, sel->pad);
 }
 
@@ -235,6 +253,9 @@ static int call_set_selection(struct v4l2_subdev *sd,
 static inline int check_edid(struct v4l2_subdev *sd,
 			     struct v4l2_subdev_edid *edid)
 {
+	if (!edid)
+		return -EINVAL;
+
 	if (edid->blocks && edid->edid == NULL)
 		return -EINVAL;
 
@@ -254,6 +275,9 @@ static int call_set_edid(struct v4l2_subdev *sd, struct v4l2_subdev_edid *edid)
 static int call_dv_timings_cap(struct v4l2_subdev *sd,
 			       struct v4l2_dv_timings_cap *cap)
 {
+	if (!cap)
+		return -EINVAL;
+
 	return check_pad(sd, cap->pad) ? :
 	       sd->ops->pad->dv_timings_cap(sd, cap);
 }
@@ -261,6 +285,9 @@ static int call_dv_timings_cap(struct v4l2_subdev *sd,
 static int call_enum_dv_timings(struct v4l2_subdev *sd,
 				struct v4l2_enum_dv_timings *dvt)
 {
+	if (!dvt)
+		return -EINVAL;
+
 	return check_pad(sd, dvt->pad) ? :
 	       sd->ops->pad->enum_dv_timings(sd, dvt);
 }
-- 
2.21.0