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[media] v4l2-ioctl: add blocks check for VIDIOC_SUBDEV_G/S_EDID 

The maximum size of an EDID is 32768 bytes, which is 32768 / 128 = 256 blocks.
Return -EINVAL if blocks > 256 to ensure that the memory allocation is sane.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Hans Verkuil 2012-10-02 02:47:58 -03:00 committed by Mauro Carvalho Chehab
parent 8a18382c31
commit 1b8b10cc7e
1 changed files with 4 additions and 0 deletions
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4
drivers/media/v4l2-core/v4l2-ioctl.c
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@ -2212,6 +2212,10 @@ static int check_array_args(unsigned int cmd, void *parg, size_t *array_size,
struct v4l2_subdev_edid *edid = parg;
if (edid->blocks) {
if (edid->blocks > 256) {
ret = -EINVAL;
break;
}
*user_ptr = (void __user *)edid->edid;
*kernel_ptr = (void *)&edid->edid;
*array_size = edid->blocks * 128;