5.15-stable review patch. If anyone has any objections, please let me know.
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From: Youngjun Lee yjjuny.lee@samsung.com
commit 782b6a718651eda3478b1824b37a8b3185d2740c upstream.
The buffer length check before calling uvc_parse_format() only ensured that the buffer has at least 3 bytes (buflen > 2), buf the function accesses buffer[3], requiring at least 4 bytes.
This can lead to an out-of-bounds read if the buffer has exactly 3 bytes.
Fix it by checking that the buffer has at least 4 bytes in uvc_parse_format().
Signed-off-by: Youngjun Lee yjjuny.lee@samsung.com Reviewed-by: Laurent Pinchart laurent.pinchart@ideasonboard.com Fixes: c0efd232929c ("V4L/DVB (8145a): USB Video Class driver") Cc: stable@vger.kernel.org Reviewed-by: Ricardo Ribalda ribalda@chromium.org Link: https://lore.kernel.org/r/20250610124107.37360-1-yjjuny.lee@samsung.com Signed-off-by: Laurent Pinchart laurent.pinchart@ideasonboard.com Signed-off-by: Hans Verkuil hverkuil@xs4all.nl Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/media/usb/uvc/uvc_driver.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/drivers/media/usb/uvc/uvc_driver.c +++ b/drivers/media/usb/uvc/uvc_driver.c @@ -512,6 +512,9 @@ static int uvc_parse_format(struct uvc_d unsigned int i, n; u8 ftype;
+ if (buflen < 4) + return -EINVAL; + format->type = buffer[2]; format->index = buffer[3];