From a83fee2c5629b8c4c73f18043df72d2a4edd5ccd Mon Sep 17 00:00:00 2001
From: Gerd Moellmann
Date: Mon, 23 Oct 2000 15:03:55 +0000
Subject: (emacs_blocked_free) [GC_MALLOC_CHECK]: Handle freeing null.

---
 src/alloc.c | 31 ++++++++++++++++---------------
 1 file changed, 16 insertions(+), 15 deletions(-)

(limited to 'src/alloc.c')

diff --git a/src/alloc.c b/src/alloc.c
index 54c4b447fde..625dc14720f 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -655,22 +655,23 @@ emacs_blocked_free (ptr)
   BLOCK_INPUT;
 
 #ifdef GC_MALLOC_CHECK
-  {
-    struct mem_node *m;
+  if (ptr)
+    {
+      struct mem_node *m;
   
-    m = mem_find (ptr);
-    if (m == MEM_NIL || m->start != ptr)
-      {
-	fprintf (stderr,
-		 "Freeing `%p' which wasn't allocated with malloc\n", ptr);
-	abort ();
-      }
-    else
-      {
-	/* fprintf (stderr, "free %p...%p (%p)\n", m->start, m->end, ptr); */
-	mem_delete (m);
-      }
-  }
+      m = mem_find (ptr);
+      if (m == MEM_NIL || m->start != ptr)
+	{
+	  fprintf (stderr,
+		   "Freeing `%p' which wasn't allocated with malloc\n", ptr);
+	  abort ();
+	}
+      else
+	{
+	  /* fprintf (stderr, "free %p...%p (%p)\n", m->start, m->end, ptr); */
+	  mem_delete (m);
+	}
+    }
 #endif /* GC_MALLOC_CHECK */
   
   __free_hook = old_free_hook;
-- 
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