If the index provided by the user is bigger than 32, we might do an out
of bound read.
CC: stable@xxxxxxxxxx
Fixes: 40140eda661e ("media: uvcvideo: Implement mask for V4L2_CTRL_TYPE_MENU")
Signed-off-by: Ricardo Ribalda <ribalda@xxxxxxxxxxxx>
---
Avoid reading index >= 31
---
drivers/media/usb/uvc/uvc_ctrl.c | 3 +++
drivers/media/usb/uvc/uvcvideo.h | 1 +
2 files changed, 4 insertions(+)
diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index 5e9d3da862dd..5e3af66a2223 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -1402,6 +1402,9 @@ int uvc_query_v4l2_menu(struct uvc_video_chain *chain,
query_menu->id = id;
query_menu->index = index;
+ if (index >= UVC_MAX_MENU)
+ return -EINVAL;
+
ret = mutex_lock_interruptible(&chain->ctrl_mutex);
if (ret < 0)
return -ERESTARTSYS;
diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
index 6fb0a78b1b00..139608f83499 100644
--- a/drivers/media/usb/uvc/uvcvideo.h
+++ b/drivers/media/usb/uvc/uvcvideo.h
@@ -101,6 +101,7 @@ struct uvc_control_info {
u32 flags;
};
+#define UVC_MAX_MENU 32
struct uvc_control_mapping {
struct list_head list;
struct list_head ev_subs;
---
base-commit: fdf0eaf11452d72945af31804e2a1048ee1b574c
change-id: 20230717-uvc-oob-4b0148a00417
Best regards,
--
Ricardo Ribalda <ribalda@xxxxxxxxxxxx>
