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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: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Dave Airlie 2011-02-24 08:35:06 +10:00
parent 3c0556e967
commit 1922756124
2 changed files with 3 additions and 2 deletions
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3
drivers/gpu/drm/drm_irq.c
View File

@ -1012,7 +1012,8 @@ int drm_modeset_ctl(struct drm_device *dev, void *data,
struct drm_file *file_priv) struct drm_file *file_priv)
{ {
struct drm_modeset_ctl *modeset = data; 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 drm_vblank_init() hasn't been called yet, just no-op */
if (!dev->num_crtcs) if (!dev->num_crtcs)

2
include/drm/drmP.h
View File

@ -1101,7 +1101,7 @@ struct drm_device {
struct platform_device *platformdev; /**< Platform device struture */ struct platform_device *platformdev; /**< Platform device struture */
struct drm_sg_mem *sg; /**< Scatter gather memory */ 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 *dev_private; /**< device private data */
void *mm_private; void *mm_private;
struct address_space *dev_mapping; struct address_space *dev_mapping;