Add and use OPENSSL_zalloc

There are many places (nearly 50) where we malloc and then memset.
Add an OPENSSL_zalloc routine to encapsulate that.
(Missed one conversion; thanks Richard)
Also fixes GH328

Reviewed-by: Richard Levitte <levitte@openssl.org>

1 files changed, 11 insertions, 4 deletions

diff --git a/crypto/mem.c b/crypto/mem.c
index 8b9c8c3805..33a76d2d08 100644
--- a/crypto/mem.c
+++ b/crypto/mem.c
@@ -312,14 +312,21 @@ void *CRYPTO_malloc(int num, const char *file, int line)
     return ret;
 }
 
+void *CRYPTO_zalloc(int num, const char *file, int line)
+{
+    void *ret = CRYPTO_malloc(num, file, line);
+
+    if (ret != NULL)
+        memset(ret, 0, num);
+    return ret;
+}
+
 char *CRYPTO_strdup(const char *str, const char *file, int line)
 {
     char *ret = CRYPTO_malloc(strlen(str) + 1, file, line);
 
-    if (ret == NULL)
-        return NULL;
-
-    strcpy(ret, str);
+    if (ret != NULL)
+        strcpy(ret, str);
     return ret;
 }