media: v4l2-subdev: Verify v4l2_subdev_call() pad config argument

Extend parameter checks performed by v4l2_subdev_call() with a check for
a non-NULL pad config pointer if V4L2_SUBDEV_FORMAT_TRY format type is
requested so drivers don't need to care.
Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
Reviewed-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/v4l2-core/v4l2-subdev.c

@@ -136,20 +136,30 @@ static inline int check_pad(struct v4l2_subdev *sd, __u32 pad)
 	return 0;
 }
 
+static int check_cfg(__u32 which, struct v4l2_subdev_pad_config *cfg)
+{
+	if (which == V4L2_SUBDEV_FORMAT_TRY && !cfg)
+		return -EINVAL;
+
+	return 0;
+}
+
 static inline int check_format(struct v4l2_subdev *sd,
+			       struct v4l2_subdev_pad_config *cfg,
 			       struct v4l2_subdev_format *format)
 {
 	if (!format)
 		return -EINVAL;
 
-	return check_which(format->which) ? : check_pad(sd, format->pad);
+	return check_which(format->which) ? : check_pad(sd, format->pad) ? :
+	       check_cfg(format->which, cfg);
 }
 
 static int call_get_fmt(struct v4l2_subdev *sd,
 			struct v4l2_subdev_pad_config *cfg,
 			struct v4l2_subdev_format *format)
 {
-	return check_format(sd, format) ? :
+	return check_format(sd, cfg, format) ? :
 	       sd->ops->pad->get_fmt(sd, cfg, format);
 }
 
@@ -157,7 +167,7 @@ static int call_set_fmt(struct v4l2_subdev *sd,
 			struct v4l2_subdev_pad_config *cfg,
 			struct v4l2_subdev_format *format)
 {
-	return check_format(sd, format) ? :
+	return check_format(sd, cfg, format) ? :
 	       sd->ops->pad->set_fmt(sd, cfg, format);
 }
 
@@ -169,6 +179,7 @@ static int call_enum_mbus_code(struct v4l2_subdev *sd,
 		return -EINVAL;
 
 	return check_which(code->which) ? : check_pad(sd, code->pad) ? :
+	       check_cfg(code->which, cfg) ? :
 	       sd->ops->pad->enum_mbus_code(sd, cfg, code);
 }
 
@@ -180,6 +191,7 @@ static int call_enum_frame_size(struct v4l2_subdev *sd,
 		return -EINVAL;
 
 	return check_which(fse->which) ? : check_pad(sd, fse->pad) ? :
+	       check_cfg(fse->which, cfg) ? :
 	       sd->ops->pad->enum_frame_size(sd, cfg, fse);
 }
 
@@ -214,23 +226,26 @@ static int call_enum_frame_interval(struct v4l2_subdev *sd,
 		return -EINVAL;
 
 	return check_which(fie->which) ? : check_pad(sd, fie->pad) ? :
+	       check_cfg(fie->which, cfg) ? :
 	       sd->ops->pad->enum_frame_interval(sd, cfg, fie);
 }
 
 static inline int check_selection(struct v4l2_subdev *sd,
+				  struct v4l2_subdev_pad_config *cfg,
 				  struct v4l2_subdev_selection *sel)
 {
 	if (!sel)
 		return -EINVAL;
 
-	return check_which(sel->which) ? : check_pad(sd, sel->pad);
+	return check_which(sel->which) ? : check_pad(sd, sel->pad) ? :
+	       check_cfg(sel->which, cfg);
 }
 
 static int call_get_selection(struct v4l2_subdev *sd,
 			      struct v4l2_subdev_pad_config *cfg,
 			      struct v4l2_subdev_selection *sel)
 {
-	return check_selection(sd, sel) ? :
+	return check_selection(sd, cfg, sel) ? :
 	       sd->ops->pad->get_selection(sd, cfg, sel);
 }
 
@@ -238,7 +253,7 @@ static int call_set_selection(struct v4l2_subdev *sd,
 			      struct v4l2_subdev_pad_config *cfg,
 			      struct v4l2_subdev_selection *sel)
 {
-	return check_selection(sd, sel) ? :
+	return check_selection(sd, cfg, sel) ? :
 	       sd->ops->pad->set_selection(sd, cfg, sel);
 }