1 files changed, 7 insertions, 0 deletions
diff --git a/src/glx/drisw_glx.c b/src/glx/drisw_glx.c
index f6aeda90abb..801ac7d470b 100644
--- a/src/glx/drisw_glx.c
+++ b/src/glx/drisw_glx.c
@@ -383,6 +383,13 @@ drisw_create_context(struct glx_screen *base,
       return NULL;
 
    if (shareList) {
+      /* If the shareList context is not a DRISW context, we cannot possibly
+       * create a DRISW context that shares it.
+       */
+      if (shareList->vtable->destroy != drisw_destroy_context) {
+	 return NULL;
+      }
+
       pcp_shared = (struct drisw_context *) shareList;
       shared = pcp_shared->driContext;
    }