nt_free): Only do arena boundary check for contiguous arenas.

diff --git a/malloc/malloc.c b/malloc/malloc.c
index 0d0990c..665d7a4 100644 (file)
--- a/malloc/malloc.c
+++ b/malloc/malloc.c
@@ -4229,8 +4229,9 @@ _int_free(mstate av, Void_t* mem)
       if (__builtin_expect (p == av->top, 0))
        goto double_free;
       /* Or whether the next chunk is beyond the boundaries of the arena.  */
-      if (__builtin_expect ((char *) nextchunk >= ((char *) av->top
-                                                  + chunksize(av->top)), 0))
+      if (__builtin_expect (contiguous (av)
+                           && (char *) nextchunk
+                              >= ((char *) av->top + chunksize(av->top)), 0))
        goto double_free;
       /* Or whether the block is actually not marked used.  */
       if (__builtin_expect (!prev_inuse(nextchunk), 0))