On Tue Jun 10 21:41:07 2025 +0900, Youngjun Lee wrote:
> 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 <[email protected]>
> Reviewed-by: Laurent Pinchart <[email protected]>
> Fixes: c0efd232929c ("V4L/DVB (8145a): USB Video Class driver")
> Cc: [email protected]
> Reviewed-by: Ricardo Ribalda <[email protected]>
> Link: https://lore.kernel.org/r/[email protected]
> Signed-off-by: Laurent Pinchart <[email protected]>
> Signed-off-by: Hans Verkuil <[email protected]>
Patch committed.
Thanks,
Hans Verkuil
drivers/media/usb/uvc/uvc_driver.c | 3 +++
1 file changed, 3 insertions(+)
---
diff --git a/drivers/media/usb/uvc/uvc_driver.c
b/drivers/media/usb/uvc/uvc_driver.c
index 916c2d13e268..62eb45435d8b 100644
--- a/drivers/media/usb/uvc/uvc_driver.c
+++ b/drivers/media/usb/uvc/uvc_driver.c
@@ -344,6 +344,9 @@ static int uvc_parse_format(struct uvc_device *dev,
u8 ftype;
int ret;
+ if (buflen < 4)
+ return -EINVAL;
+
format->type = buffer[2];
format->index = buffer[3];
format->frames = frames;
