svn commit: r275209 - head/sys/dev/drm2

[Eygene Ryabinkin]

Author: rea (ports committer)
Date: Fri Nov 28 12:14:59 2014
New Revision: 275209
URL: https://svnweb.freebsd.org/changeset/base/275209

Log:
  DRM2: fix off-by-one overflow in ioctl processing
  
  Call to the driver-specific ioctl used to process ioctl number
  that will lead to the out-of-bounds access to the ioctl handler
  array.
  
  PR:		193367
  Approved by:	kib
  MFC after:	1 week

Modified:
  head/sys/dev/drm2/drm_drv.c

Modified: head/sys/dev/drm2/drm_drv.c
==============================================================================
--- head/sys/dev/drm2/drm_drv.c	Fri Nov 28 11:49:26 2014	(r275208)
+++ head/sys/dev/drm2/drm_drv.c	Fri Nov 28 12:14:59 2014	(r275209)
@@ -905,7 +905,7 @@ int drm_ioctl(struct cdev *kdev, u_long 
 	if (ioctl->func == NULL && nr >= DRM_COMMAND_BASE) {
 		/* The array entries begin at DRM_COMMAND_BASE ioctl nr */
 		nr -= DRM_COMMAND_BASE;
-		if (nr > dev->driver->max_ioctl) {
+		if (nr >= dev->driver->max_ioctl) {
 			DRM_DEBUG("Bad driver ioctl number, 0x%x (of 0x%x)\n",
 			    nr, dev->driver->max_ioctl);
 			return EINVAL;