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>

diff --git a/drivers/gpu/drm/r128/r128_cce.c b/drivers/gpu/drm/r128/r128_cce.c
index 15252f60bbd3ee53800106a82d29d05ee466a3f0..4c39a407aa4af51b6f3554c3a40fc9bd9acffb7f 100644 (file)
--- 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);
 }
 

diff --git a/drivers/gpu/drm/r128/r128_drv.h b/drivers/gpu/drm/r128/r128_drv.h
index 797a26c42dababf8c12193271aaf336849271424..3c60829d82e9627394a2b6f946d710f5ffe4c2b6 100644 (file)
--- a/drivers/gpu/drm/r128/r128_drv.h
+++ b/drivers/gpu/drm/r128/r128_drv.h
@@ -422,6 +422,14 @@ static __inline__ void r128_update_ring_snapshot(drm_r128_private_t * dev_priv)
  * Misc helper macros
  */
 
+#define DEV_INIT_TEST_WITH_RETURN(_dev_priv)                           \
+do {                                                                   \
+       if (!_dev_priv) {                                               \
+               DRM_ERROR("called with no initialization\n");           \
+               return -EINVAL;                                         \
+       }                                                               \
+} while (0)
+
 #define RING_SPACE_TEST_WITH_RETURN( dev_priv )                                \
 do {                                                                   \
        drm_r128_ring_buffer_t *ring = &dev_priv->ring; int i;          \

diff --git a/drivers/gpu/drm/r128/r128_state.c b/drivers/gpu/drm/r128/r128_state.c
index 026a48c95c8f51ce57047ff92ce641917f74e240..af2665cf4718ca8b92c56130e9a5aec0f80845a6 100644 (file)
--- a/drivers/gpu/drm/r128/r128_state.c
+++ b/drivers/gpu/drm/r128/r128_state.c
@@ -1244,14 +1244,18 @@ static void r128_cce_dispatch_stipple(struct drm_device * dev, u32 * stipple)
 static int r128_cce_clear(struct drm_device *dev, void *data, struct drm_file *file_priv)
 {
        drm_r128_private_t *dev_priv = dev->dev_private;
-       drm_r128_sarea_t *sarea_priv = dev_priv->sarea_priv;
+       drm_r128_sarea_t *sarea_priv;
        drm_r128_clear_t *clear = data;
        DRM_DEBUG("\n");
 
        LOCK_TEST_WITH_RETURN(dev, file_priv);
 
+       DEV_INIT_TEST_WITH_RETURN(dev_priv);
+
        RING_SPACE_TEST_WITH_RETURN(dev_priv);
 
+       sarea_priv = dev_priv->sarea_priv;
+
        if (sarea_priv->nbox > R128_NR_SAREA_CLIPRECTS)
                sarea_priv->nbox = R128_NR_SAREA_CLIPRECTS;
 
@@ -1312,6 +1316,8 @@ static int r128_cce_flip(struct drm_device *dev, void *data, struct drm_file *fi
 
        LOCK_TEST_WITH_RETURN(dev, file_priv);
 
+       DEV_INIT_TEST_WITH_RETURN(dev_priv);
+
        RING_SPACE_TEST_WITH_RETURN(dev_priv);
 
        if (!dev_priv->page_flipping)
@@ -1331,6 +1337,8 @@ static int r128_cce_swap(struct drm_device *dev, void *data, struct drm_file *fi
 
        LOCK_TEST_WITH_RETURN(dev, file_priv);
 
+       DEV_INIT_TEST_WITH_RETURN(dev_priv);
+
        RING_SPACE_TEST_WITH_RETURN(dev_priv);
 
        if (sarea_priv->nbox > R128_NR_SAREA_CLIPRECTS)
@@ -1354,10 +1362,7 @@ static int r128_cce_vertex(struct drm_device *dev, void *data, struct drm_file *
 
        LOCK_TEST_WITH_RETURN(dev, file_priv);
 
-       if (!dev_priv) {
-               DRM_ERROR("called with no initialization\n");
-               return -EINVAL;
-       }
+       DEV_INIT_TEST_WITH_RETURN(dev_priv);
 
        DRM_DEBUG("pid=%d index=%d count=%d discard=%d\n",
                  DRM_CURRENTPID, vertex->idx, vertex->count, vertex->discard);
@@ -1410,10 +1415,7 @@ static int r128_cce_indices(struct drm_device *dev, void *data, struct drm_file
 
        LOCK_TEST_WITH_RETURN(dev, file_priv);
 
-       if (!dev_priv) {
-               DRM_ERROR("called with no initialization\n");
-               return -EINVAL;
-       }
+       DEV_INIT_TEST_WITH_RETURN(dev_priv);
 
        DRM_DEBUG("pid=%d buf=%d s=%d e=%d d=%d\n", DRM_CURRENTPID,
                  elts->idx, elts->start, elts->end, elts->discard);
@@ -1476,6 +1478,8 @@ static int r128_cce_blit(struct drm_device *dev, void *data, struct drm_file *fi
 
        LOCK_TEST_WITH_RETURN(dev, file_priv);
 
+       DEV_INIT_TEST_WITH_RETURN(dev_priv);
+
        DRM_DEBUG("pid=%d index=%d\n", DRM_CURRENTPID, blit->idx);
 
        if (blit->idx < 0 || blit->idx >= dma->buf_count) {
@@ -1501,6 +1505,8 @@ static int r128_cce_depth(struct drm_device *dev, void *data, struct drm_file *f
 
        LOCK_TEST_WITH_RETURN(dev, file_priv);
 
+       DEV_INIT_TEST_WITH_RETURN(dev_priv);
+
        RING_SPACE_TEST_WITH_RETURN(dev_priv);
 
        ret = -EINVAL;
@@ -1531,6 +1537,8 @@ static int r128_cce_stipple(struct drm_device *dev, void *data, struct drm_file
 
        LOCK_TEST_WITH_RETURN(dev, file_priv);
 
+       DEV_INIT_TEST_WITH_RETURN(dev_priv);
+
        if (DRM_COPY_FROM_USER(&mask, stipple->mask, 32 * sizeof(u32)))
                return -EFAULT;
 
@@ -1555,10 +1563,7 @@ static int r128_cce_indirect(struct drm_device *dev, void *data, struct drm_file
 
        LOCK_TEST_WITH_RETURN(dev, file_priv);
 
-       if (!dev_priv) {
-               DRM_ERROR("called with no initialization\n");
-               return -EINVAL;
-       }
+       DEV_INIT_TEST_WITH_RETURN(dev_priv);
 
        DRM_DEBUG("idx=%d s=%d e=%d d=%d\n",
                  indirect->idx, indirect->start, indirect->end,
@@ -1620,10 +1625,7 @@ static int r128_getparam(struct drm_device *dev, void *data, struct drm_file *fi
        drm_r128_getparam_t *param = data;
        int value;
 
-       if (!dev_priv) {
-               DRM_ERROR("called with no initialization\n");
-               return -EINVAL;
-       }
+       DEV_INIT_TEST_WITH_RETURN(dev_priv);
 
        DRM_DEBUG("pid=%d\n", DRM_CURRENTPID);