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media: uvcvideo: Prevent heap overflow when accessing mapped controls

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The size of uvc_control_mapping is user controlled leading to a
potential heap overflow in the uvc driver. This adds a check to verify
the user provided size fits within the bounds of the defined buffer
size.

Originally-from: Richard Simmons <rssimmo@amazon.com>

Cc: stable@vger.kernel.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Guenter Roeck 2017-08-08 08:56:21 -04:00 committed by Mauro Carvalho Chehab
parent da6df1c4dc
commit 7e09f7d5c7
1 changed files with 7 additions and 0 deletions
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7
drivers/media/usb/uvc/uvc_ctrl.c
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@ -2002,6 +2002,13 @@ int uvc_ctrl_add_mapping(struct uvc_video_chain *chain,
goto done;
}
/* Validate the user-provided bit-size and offset */
if (mapping->size > 32 ||
mapping->offset + mapping->size > ctrl->info.size * 8) {
ret = -EINVAL;
goto done;
}
list_for_each_entry(map, &ctrl->info.mappings, list) {
if (mapping->id == map->id) {
uvc_trace(UVC_TRACE_CONTROL, "Can't add mapping '%s', "