V4L/DVB (10293): uvcvideo: replace strn{cpy,cat} with strl{cpy,cat}.

strncpy is unsafe as it doesn't append a terminating NUL character when the
source string doesn't fit in the destination buffer. Replace it with strlcpy.
strncat is misused as its size argument refers to the source string, not the
destination buffer. Replace it with strlcat.

Signed-off-by: Laurent Pinchart <laurent.pinchart@skynet.be>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/uvc/uvc_ctrl.c

@@ -786,7 +786,7 @@ int uvc_query_v4l2_ctrl(struct uvc_video_device *video,
 	memset(v4l2_ctrl, 0, sizeof *v4l2_ctrl);
 	v4l2_ctrl->id = mapping->id;
 	v4l2_ctrl->type = mapping->v4l2_type;
-	strncpy(v4l2_ctrl->name, mapping->name, sizeof v4l2_ctrl->name);
+	strlcpy(v4l2_ctrl->name, mapping->name, sizeof v4l2_ctrl->name);
 	v4l2_ctrl->flags = 0;
 
 	if (!(ctrl->info->flags & UVC_CONTROL_SET_CUR))

drivers/media/video/uvc/uvc_driver.c

@@ -314,7 +314,7 @@ static int uvc_parse_format(struct uvc_device *dev,
 		fmtdesc = uvc_format_by_guid(&buffer[5]);
 
 		if (fmtdesc != NULL) {
-			strncpy(format->name, fmtdesc->name,
+			strlcpy(format->name, fmtdesc->name,
 				sizeof format->name);
 			format->fcc = fmtdesc->fcc;
 		} else {
@@ -345,7 +345,7 @@ static int uvc_parse_format(struct uvc_device *dev,
 			return -EINVAL;
 		}
 
-		strncpy(format->name, "MJPEG", sizeof format->name);
+		strlcpy(format->name, "MJPEG", sizeof format->name);
 		format->fcc = V4L2_PIX_FMT_MJPEG;
 		format->flags = UVC_FMT_FLAG_COMPRESSED;
 		format->bpp = 0;
@@ -363,13 +363,13 @@ static int uvc_parse_format(struct uvc_device *dev,
 
 		switch (buffer[8] & 0x7f) {
 		case 0:
-			strncpy(format->name, "SD-DV", sizeof format->name);
+			strlcpy(format->name, "SD-DV", sizeof format->name);
 			break;
 		case 1:
-			strncpy(format->name, "SDL-DV", sizeof format->name);
+			strlcpy(format->name, "SDL-DV", sizeof format->name);
 			break;
 		case 2:
-			strncpy(format->name, "HD-DV", sizeof format->name);
+			strlcpy(format->name, "HD-DV", sizeof format->name);
 			break;
 		default:
 			uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
@@ -379,7 +379,7 @@ static int uvc_parse_format(struct uvc_device *dev,
 			return -EINVAL;
 		}
 
-		strncat(format->name, buffer[8] & (1 << 7) ? " 60Hz" : " 50Hz",
+		strlcat(format->name, buffer[8] & (1 << 7) ? " 60Hz" : " 50Hz",
 			sizeof format->name);
 
 		format->fcc = V4L2_PIX_FMT_DV;
@@ -1526,7 +1526,7 @@ static int uvc_register_video(struct uvc_device *dev)
 	vdev->minor = -1;
 	vdev->fops = &uvc_fops;
 	vdev->release = video_device_release;
-	strncpy(vdev->name, dev->name, sizeof vdev->name);
+	strlcpy(vdev->name, dev->name, sizeof vdev->name);
 
 	/* Set the driver data before calling video_register_device, otherwise
 	 * uvc_v4l2_open might race us.
@@ -1621,7 +1621,7 @@ static int uvc_probe(struct usb_interface *intf,
 	dev->quirks = id->driver_info | uvc_quirks_param;
 
 	if (udev->product != NULL)
-		strncpy(dev->name, udev->product, sizeof dev->name);
+		strlcpy(dev->name, udev->product, sizeof dev->name);
 	else
 		snprintf(dev->name, sizeof dev->name,
 			"UVC Camera (%04x:%04x)",

drivers/media/video/uvc/uvc_v4l2.c

@@ -55,7 +55,7 @@ static int uvc_v4l2_query_menu(struct uvc_video_device *video,
 		return -EINVAL;
 
 	menu_info = &mapping->menu_info[query_menu->index];
-	strncpy(query_menu->name, menu_info->name, 32);
+	strlcpy(query_menu->name, menu_info->name, sizeof query_menu->name);
 	return 0;
 }
 
@@ -486,9 +486,9 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
 		struct v4l2_capability *cap = arg;
 
 		memset(cap, 0, sizeof *cap);
-		strncpy(cap->driver, "uvcvideo", sizeof cap->driver);
-		strncpy(cap->card, vdev->name, 32);
-		strncpy(cap->bus_info, video->dev->udev->bus->bus_name,
+		strlcpy(cap->driver, "uvcvideo", sizeof cap->driver);
+		strlcpy(cap->card, vdev->name, sizeof cap->card);
+		strlcpy(cap->bus_info, video->dev->udev->bus->bus_name,
 			sizeof cap->bus_info);
 		cap->version = DRIVER_VERSION_NUMBER;
 		if (video->streaming->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
@@ -620,7 +620,7 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
 
 		memset(input, 0, sizeof *input);
 		input->index = index;
-		strncpy(input->name, iterm->name, sizeof input->name);
+		strlcpy(input->name, iterm->name, sizeof input->name);
 		if (UVC_ENTITY_TYPE(iterm) == ITT_CAMERA)
 			input->type = V4L2_INPUT_TYPE_CAMERA;
 		break;
@@ -682,7 +682,7 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
 		fmt->flags = 0;
 		if (format->flags & UVC_FMT_FLAG_COMPRESSED)
 			fmt->flags |= V4L2_FMT_FLAG_COMPRESSED;
-		strncpy(fmt->description, format->name,
+		strlcpy(fmt->description, format->name,
 			sizeof fmt->description);
 		fmt->description[sizeof fmt->description - 1] = 0;
 		fmt->pixelformat = format->fcc;