* buffer.c (compare_overlays): Don't assume args differ (Bug#6830).

2 files changed, 7 insertions, 1 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 07cc8dac1b3..1ec148b30c8 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,7 @@
+2012-03-12  Paul Eggert  <eggert@cs.ucla.edu>
+
+        * buffer.c (compare_overlays): Don't assume args differ (Bug#6830).
+
 2012-03-12  Chong Yidong  <cyd@gnu.org>
 
         * eval.c (inhibit_lisp_code): Rename from
diff --git a/src/buffer.c b/src/buffer.c
index efb9a80f35d..1fea19b0d65 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -2868,7 +2868,9 @@ compare_overlays (const void *v1, const void *v2)
      between "equal" overlays.  The result can still change between
      invocations of Emacs, but it won't change in the middle of
      `find_field' (bug#6830).  */
-  return XHASH (s1->overlay) < XHASH (s2->overlay) ? -1 : 1;
+  if (XHASH (s1->overlay) != XHASH (s2->overlay))
+    return XHASH (s1->overlay) < XHASH (s2->overlay) ? -1 : 1;
+  return 0;
 }
 
 /* Sort an array of overlays by priority.  The array is modified in place.