Messages in this thread Patch in this message | | | From | Ben Hutchings <> | Date | Wed, 22 Nov 2017 02:11:06 +0000 | Subject | [PATCH 3.2 19/61] media: uvcvideo: Prevent heap overflow when accessing mapped controls |
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3.2.96-rc1 review patch. If anyone has any objections, please let me know.
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From: Guenter Roeck <linux@roeck-us.net>
commit 7e09f7d5c790278ab98e5f2c22307ebe8ad6e8ba upstream.
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>
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> [bwh: Backported to 3.2: adjust filename] Signed-off-by: Ben Hutchings <ben@decadent.org.uk> --- drivers/media/video/uvc/uvc_ctrl.c | 7 +++++++ 1 file changed, 7 insertions(+)
--- a/drivers/media/video/uvc/uvc_ctrl.c +++ b/drivers/media/video/uvc/uvc_ctrl.c @@ -1698,6 +1698,13 @@ int uvc_ctrl_add_mapping(struct uvc_vide 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', "
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