gallium: added null ptr check in align_free()

diff --git a/src/gallium/auxiliary/util/u_memory.h b/src/gallium/auxiliary/util/u_memory.h
index ceb3a1cb6154d20b9ad8d3ef826c8d5e6e4a8748..0b18d043adb2a52cee9abc8961c3b17cd950b3b2 100644 (file)
--- a/src/gallium/auxiliary/util/u_memory.h
+++ b/src/gallium/auxiliary/util/u_memory.h
@@ -191,9 +191,11 @@ align_free(void *ptr)
 #if defined(HAVE_POSIX_MEMALIGN)
    FREE(ptr);
 #else
-   void **cubbyHole = (void **) ((char *) ptr - sizeof(void *));
-   void *realAddr = *cubbyHole;
-   FREE(realAddr);
+   if (ptr) {
+      void **cubbyHole = (void **) ((char *) ptr - sizeof(void *));
+      void *realAddr = *cubbyHole;
+      FREE(realAddr);
+   }
 #endif /* defined(HAVE_POSIX_MEMALIGN) */
 }