From: Youngjun Lee <yjjuny.lee@samsung.com> stable inclusion from stable-v6.6.103 commit a97e062e4ff3dab84a2f1eb811e9eddc6699e2a9 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/ICWGIM CVE: CVE-2025-38680 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- 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> Signed-off-by: Huang Xiaojia <huangxiaojia2@huawei.com> --- 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 ae2e8bd2b3f7..1a6a3c1cb4ae 100644 --- a/drivers/media/usb/uvc/uvc_driver.c +++ b/drivers/media/usb/uvc/uvc_driver.c @@ -235,6 +235,9 @@ static int uvc_parse_format(struct uvc_device *dev, unsigned int i, n; u8 ftype; + if (buflen < 4) + return -EINVAL; + format->type = buffer[2]; format->index = buffer[3]; format->frames = frames; -- 2.34.1