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-rw-r--r--common/dlmalloc.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/common/dlmalloc.c b/common/dlmalloc.c
index 4871f4b099..e9bab09b8e 100644
--- a/common/dlmalloc.c
+++ b/common/dlmalloc.c
@@ -1511,6 +1511,13 @@ void *sbrk(ptrdiff_t increment)
ulong old = mem_malloc_brk;
ulong new = old + increment;
+ /*
+ * if we are giving memory back make sure we clear it out since
+ * we set MORECORE_CLEARS to 1
+ */
+ if (increment < 0)
+ memset((void *)new, 0, -increment);
+
if ((new < mem_malloc_start) || (new > mem_malloc_end))
return (void *)MORECORE_FAILURE;