svn commit: r282141 - stable/10/sys/dev/drm2

[Jean-Sebastien Pedron]

Author: dumbbell
Date: Tue Apr 28 12:37:09 2015
New Revision: 282141
URL: https://svnweb.freebsd.org/changeset/base/282141

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 of:		r275209 (original commit by rea)

Modified:
  stable/10/sys/dev/drm2/drm_drv.c
Directory Properties:
  stable/10/   (props changed)

Modified: stable/10/sys/dev/drm2/drm_drv.c
==============================================================================
--- stable/10/sys/dev/drm2/drm_drv.c	Tue Apr 28 12:02:24 2015	(r282140)
+++ stable/10/sys/dev/drm2/drm_drv.c	Tue Apr 28 12:37:09 2015	(r282141)
@@ -909,7 +909,7 @@ 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;