From faff5bbb2762c44ec7426037b3000e77a11d6773 Mon Sep 17 00:00:00 2001 From: Benoit Sevens Date: Thu, 7 Nov 2024 14:22:02 +0000 Subject: [PATCH] media: uvcvideo: Skip parsing frames of type UVC_VS_UNDEFINED in uvc_parse_format commit ecf2b43018da9579842c774b7f35dbe11b5c38dd upstream. This can lead to out of bounds writes since frames of this type were not taken into account when calculating the size of the frames buffer in uvc_parse_streaming. Fixes: c0efd232929c ("V4L/DVB (8145a): USB Video Class driver") Signed-off-by: Benoit Sevens Cc: stable@vger.kernel.org Acked-by: Greg Kroah-Hartman Reviewed-by: Laurent Pinchart Signed-off-by: Hans Verkuil Signed-off-by: Greg Kroah-Hartman --- drivers/media/usb/uvc/uvc_driver.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c index cfbc7595cd0b..519fd648f26c 100644 --- a/drivers/media/usb/uvc/uvc_driver.c +++ b/drivers/media/usb/uvc/uvc_driver.c @@ -661,7 +661,7 @@ static int uvc_parse_format(struct uvc_device *dev, /* Parse the frame descriptors. Only uncompressed, MJPEG and frame * based formats have frame descriptors. */ - while (buflen > 2 && buffer[1] == USB_DT_CS_INTERFACE && + while (ftype && buflen > 2 && buffer[1] == USB_DT_CS_INTERFACE && buffer[2] == ftype) { frame = &format->frame[format->nframes]; if (ftype != UVC_VS_FRAME_FRAME_BASED) -- 2.39.5