From 5898f4548efdcd7c0fd437a74eeb80facc51a117 Mon Sep 17 00:00:00 2001
From: Florian Weimer <fweimer@redhat.com>
Date: Wed, 30 Aug 2017 20:10:56 +0200
Subject: dynarray: Set errno on overflow-induced allocation failure

This allows the caller to return directly on such an error, with an
appropriate errno value.
---
 malloc/dynarray_resize.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

(limited to 'malloc/dynarray_resize.c')

diff --git a/malloc/dynarray_resize.c b/malloc/dynarray_resize.c
index e6dc9fbc68..63c981bf61 100644
--- a/malloc/dynarray_resize.c
+++ b/malloc/dynarray_resize.c
@@ -17,6 +17,7 @@
    <http://www.gnu.org/licenses/>.  */
 
 #include <dynarray.h>
+#include <errno.h>
 #include <malloc-internal.h>
 #include <stdlib.h>
 #include <string.h>
@@ -38,7 +39,11 @@ __libc_dynarray_resize (struct dynarray_header *list, size_t size,
 
   size_t new_size_bytes;
   if (check_mul_overflow_size_t (size, element_size, &new_size_bytes))
-    return false;
+    {
+      /* Overflow.  */
+      __set_errno (ENOMEM);
+      return false;
+    }
   void *new_array;
   if (list->array == scratch)
     {
-- 
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