V4L/DVB (8207): uvcvideo: Fix a buffer overflow in format descriptor parsing
Thanks to Oliver Neukum for catching and reporting this bug.
Signed-off-by: Laurent Pinchart <laurent.pinchart@skynet.be>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
diff --git a/drivers/media/video/uvc/uvc_driver.c b/drivers/media/video/uvc/uvc_driver.c
index 60ced58..86bb16d 100644
--- a/drivers/media/video/uvc/uvc_driver.c
+++ b/drivers/media/video/uvc/uvc_driver.c
@@ -298,7 +298,8 @@
switch (buffer[2]) {
case VS_FORMAT_UNCOMPRESSED:
case VS_FORMAT_FRAME_BASED:
- if (buflen < 27) {
+ n = buffer[2] == VS_FORMAT_UNCOMPRESSED ? 27 : 28;
+ if (buflen < n) {
uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming"
"interface %d FORMAT error\n",
dev->udev->devnum,