[074/129] [media] uvcvideo: Fix integer overflow in uvc_ioctl_ctrl_map()

From: Greg KH
Date: Mon Jan 23 2012 - 21:47:48 EST


3.2-stable review patch. If anyone has any objections, please let me know.

------------------
Content-Length: 1836
Lines: 53

From: Haogang Chen <haogangchen@xxxxxxxxx>

commit 806e23e95f94a27ee445022d724060b9b45cb64a upstream.

There is a potential integer overflow in uvc_ioctl_ctrl_map(). When a
large xmap->menu_count is passed from the userspace, the subsequent call
to kmalloc() will allocate a buffer smaller than expected.
map->menu_count and map->menu_info would later be used in a loop (e.g.
in uvc_query_v4l2_ctrl), which leads to out-of-bound access.

The patch checks the ioctl argument and returns -EINVAL for zero or too
large values in xmap->menu_count.

Signed-off-by: Haogang Chen <haogangchen@xxxxxxxxx>
[laurent.pinchart@xxxxxxxxxxxxxxxx Prevent excessive memory consumption]
Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
drivers/media/video/uvc/uvc_v4l2.c | 9 +++++++++
drivers/media/video/uvc/uvcvideo.h | 1 +
2 files changed, 10 insertions(+)

--- a/drivers/media/video/uvc/uvc_v4l2.c
+++ b/drivers/media/video/uvc/uvc_v4l2.c
@@ -58,6 +58,15 @@ static int uvc_ioctl_ctrl_map(struct uvc
break;

case V4L2_CTRL_TYPE_MENU:
+ /* Prevent excessive memory consumption, as well as integer
+ * overflows.
+ */
+ if (xmap->menu_count == 0 ||
+ xmap->menu_count > UVC_MAX_CONTROL_MENU_ENTRIES) {
+ ret = -EINVAL;
+ goto done;
+ }
+
size = xmap->menu_count * sizeof(*map->menu_info);
map->menu_info = kmalloc(size, GFP_KERNEL);
if (map->menu_info == NULL) {
--- a/drivers/media/video/uvc/uvcvideo.h
+++ b/drivers/media/video/uvc/uvcvideo.h
@@ -113,6 +113,7 @@

/* Maximum allowed number of control mappings per device */
#define UVC_MAX_CONTROL_MAPPINGS 1024
+#define UVC_MAX_CONTROL_MENU_ENTRIES 32

/* Devices quirks */
#define UVC_QUIRK_STATUS_INTERVAL 0x00000001


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