diff --git a/src/uxa/intel_memory.c b/src/uxa/intel_memory.c
index e51fa33..83a7425 100644
--- a/src/uxa/intel_memory.c
+++ b/src/uxa/intel_memory.c
@@ -213,6 +213,14 @@ drm_intel_bo *intel_allocate_framebuffer(ScrnInfoPtr scrn,
 					unsigned long *out_pitch,
 					uint32_t *out_tiling)
 {
+	assert(scrn != null);
+	assert(out_pitch != null);
+	assert(out_tiling != null);
+
+	if (width <= 0 || height <= 0) {
+		return NULL;
+	}
+
 	intel_screen_private *intel = intel_get_screen_private(scrn);
 	drm_intel_bo *front_buffer;
 	uint32_t tiling_mode;