drm/client: Prevent NULL dereference in drm_client_buffer_delete()

The drm_gem_vunmap() will crash with a NULL dereference if the passed
object pointer is NULL. It wasn't a problem before we added the locking
support to drm_gem_vunmap function because the mapping argument was always
NULL together with the object. Make drm_client_buffer_delete() to check
whether GEM is NULL before trying to unmap the GEM, it will happen on
framebuffer creation error.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Link: https://lore.kernel.org/dri-devel/Y1kFEGxT8MVlf32V@kili/
Fixes: 79e2cf2e7a19 ("drm/gem: Take reservation lock for vmap/vunmap operations")
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221030154412.8320-3-dmitry.osipenko@collabora.com

diff --git a/drivers/gpu/drm/drm_client.c b/drivers/gpu/drm/drm_client.c
index 38e1be991caa5e2c4226003d32205c5772720992..fd67efe37c636086ea0a230e89b7d4c7e31ce389 100644 (file)
--- a/drivers/gpu/drm/drm_client.c
+++ b/drivers/gpu/drm/drm_client.c
@@ -235,10 +235,10 @@ static void drm_client_buffer_delete(struct drm_client_buffer *buffer)
 {
        struct drm_device *dev = buffer->client->dev;
 
-       drm_gem_vunmap_unlocked(buffer->gem, &buffer->map);
-
-       if (buffer->gem)
+       if (buffer->gem) {
+               drm_gem_vunmap_unlocked(buffer->gem, &buffer->map);
                drm_gem_object_put(buffer->gem);
+       }
 
        if (buffer->handle)
                drm_mode_destroy_dumb(dev, buffer->handle, buffer->client->file);