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authorDave Airlie <airlied@redhat.com>2011-02-24 01:35:06 +0300
committerDave Airlie <airlied@redhat.com>2011-02-28 08:24:35 +0300
commit1922756124ddd53846877416d92ba4a802bc658f (patch)
tree22b5b5e5457d5eab364cd2c860814b29874e56f7
parent3c0556e9673f79e386b27768e27d18b3ce29e40e (diff)
downloadlinux-1922756124ddd53846877416d92ba4a802bc658f.tar.xz
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>
-rw-r--r--drivers/gpu/drm/drm_irq.c3
-rw-r--r--include/drm/drmP.h2
2 files changed, 3 insertions, 2 deletions
diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index 53120a72a48c..28d1d3c24d65 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -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)
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index fe29aadb129d..348843b80150 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -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;