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Commit 19227561 authored by Dave Airlie's avatar Dave Airlie
Browse files

drm: fix unsigned vs signed comparison issue in modeset ctl ioctl. 



This fixes CVE-2011-1013.

Reported-by: Matthiew Herrb (OpenBSD X.org team)
Cc: stable@kernel.org
Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
parent 3c0556e9

drivers/gpu/drm/drm_irq.c

+2 −1
Original line number Diff line number Diff line
@@ -1012,7 +1012,8 @@ int drm_modeset_ctl(struct drm_device *dev, void *data, 
		    struct drm_file *file_priv)

{

	struct drm_modeset_ctl *modeset = data;

	int crtc, ret = 0;

	int ret = 0;

	unsigned int crtc;



	/* If drm_vblank_init() hasn't been called yet, just no-op */

	if (!dev->num_crtcs)

include/drm/drmP.h

+1 −1
Original line number Diff line number Diff line
@@ -1101,7 +1101,7 @@ struct drm_device { 
	struct platform_device *platformdev; /**< Platform device struture */



	struct drm_sg_mem *sg;	/**< Scatter gather memory */

	int num_crtcs;                  /**< Number of CRTCs on this device */

	unsigned int num_crtcs;                  /**< Number of CRTCs on this device */

	void *dev_private;		/**< device private data */

	void *mm_private;

	struct address_space *dev_mapping;