[glib] Bug 724590 - GSlice slab_stack corruption

[John Ralls <jralls src gnome org>]

commit c49ec3c8d7a90589308ce1b87a92bc627335ffd2
Author: John Ralls <jralls ceridwen us>
Date:   Mon Feb 17 15:51:38 2014 -0800

    Bug 724590 - GSlice slab_stack corruption
    
    Dereference allocation->contention_counters before trying to take the
    address of an element.

 glib/gslice.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/glib/gslice.c b/glib/gslice.c
index 0563d80..2c5f4fb 100644
--- a/glib/gslice.c
+++ b/glib/gslice.c
@@ -715,7 +715,8 @@ static ChunkLink*
 magazine_cache_pop_magazine (guint  ix,
                              gsize *countp)
 {
-  g_mutex_lock_a (&allocator->magazine_mutex, &allocator->contention_counters[ix]);
+  guint *counters = allocator->contention_counters;
+  g_mutex_lock_a (&allocator->magazine_mutex, &counters[ix]);
   if (!allocator->magazines[ix])
     {
       guint magazine_threshold = allocator_get_magazine_threshold (allocator, ix);