diff options
| author | Ben Hutchings <ben@decadent.org.uk> | 2009-08-23 19:59:04 +0400 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2009-08-31 03:09:30 +0400 |
| commit | 7dc482dfeeeefcfd000d4271c4626937406756d7 (patch) | |
| tree | 2ec9a70ecad5f7cb94136d53d98d587837f05ef3 /drivers/gpu/drm/r128/r128_cce.c | |
| parent | 70967ab9c0c9017645d167d33675eab996633631 (diff) | |
| download | linux-7dc482dfeeeefcfd000d4271c4626937406756d7.tar.xz | |
drm/r128: Add test for initialisation to all ioctls that require it
Almost all r128's private ioctls require that the CCE state has
already been initialised. However, most do not test that this has
been done, and will proceed to dereference a null pointer. This may
result in a security vulnerability, since some ioctls are
unprivileged.
This adds a macro for the common initialisation test and changes all
ioctl implementations that require prior initialisation to use that
macro.
Also, r128_do_init_cce() does not test that the CCE state has not
been initialised already. Repeated initialisation may lead to a crash
or resource leak. This adds that test.
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/r128/r128_cce.c')
| -rw-r--r-- | drivers/gpu/drm/r128/r128_cce.c | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/drivers/gpu/drm/r128/r128_cce.c b/drivers/gpu/drm/r128/r128_cce.c index 15252f60bbd3..4c39a407aa4a 100644 --- a/drivers/gpu/drm/r128/r128_cce.c +++ b/drivers/gpu/drm/r128/r128_cce.c @@ -346,6 +346,11 @@ static int r128_do_init_cce(struct drm_device * dev, drm_r128_init_t * init) DRM_DEBUG("\n"); + if (dev->dev_private) { + DRM_DEBUG("called when already initialized\n"); + return -EINVAL; + } + dev_priv = kzalloc(sizeof(drm_r128_private_t), GFP_KERNEL); if (dev_priv == NULL) return -ENOMEM; @@ -647,6 +652,8 @@ int r128_cce_start(struct drm_device *dev, void *data, struct drm_file *file_pri LOCK_TEST_WITH_RETURN(dev, file_priv); + DEV_INIT_TEST_WITH_RETURN(dev_priv); + if (dev_priv->cce_running || dev_priv->cce_mode == R128_PM4_NONPM4) { DRM_DEBUG("while CCE running\n"); return 0; @@ -669,6 +676,8 @@ int r128_cce_stop(struct drm_device *dev, void *data, struct drm_file *file_priv LOCK_TEST_WITH_RETURN(dev, file_priv); + DEV_INIT_TEST_WITH_RETURN(dev_priv); + /* Flush any pending CCE commands. This ensures any outstanding * commands are exectuted by the engine before we turn it off. */ @@ -706,10 +715,7 @@ int r128_cce_reset(struct drm_device *dev, void *data, struct drm_file *file_pri LOCK_TEST_WITH_RETURN(dev, file_priv); - if (!dev_priv) { - DRM_DEBUG("called before init done\n"); - return -EINVAL; - } + DEV_INIT_TEST_WITH_RETURN(dev_priv); r128_do_cce_reset(dev_priv); @@ -726,6 +732,8 @@ int r128_cce_idle(struct drm_device *dev, void *data, struct drm_file *file_priv LOCK_TEST_WITH_RETURN(dev, file_priv); + DEV_INIT_TEST_WITH_RETURN(dev_priv); + if (dev_priv->cce_running) { r128_do_cce_flush(dev_priv); } @@ -739,6 +747,8 @@ int r128_engine_reset(struct drm_device *dev, void *data, struct drm_file *file_ LOCK_TEST_WITH_RETURN(dev, file_priv); + DEV_INIT_TEST_WITH_RETURN(dev->dev_private); + return r128_do_engine_reset(dev); } |