X-Git-Url: https://git.openssl.org/gitweb/?p=openssl.git;a=blobdiff_plain;f=crypto%2Fmem_clr.c;h=e6450a12fe594691e238d940c12439c7da65ccc3;hp=3df1f3928d06881630978c8a688ede833f39fe4c;hb=9e58d1192da2dbd6544f73f73362db6ae9f2c045;hpb=0f113f3ee4d629ef9a4a30911b22b224772085e5

diff --git a/crypto/mem_clr.c b/crypto/mem_clr.c
index 3df1f3928d..e6450a12fe 100644
--- a/crypto/mem_clr.c
+++ b/crypto/mem_clr.c
@@ -1,4 +1,3 @@
-/* crypto/mem_clr.c -*- mode:C; c-file-style: "eay" -*- */
 /*
  * Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL project
  * 2002.
@@ -60,12 +59,17 @@
 #include <string.h>
 #include <openssl/crypto.h>
 
+extern unsigned char cleanse_ctr;
 unsigned char cleanse_ctr = 0;
 
 void OPENSSL_cleanse(void *ptr, size_t len)
 {
     unsigned char *p = ptr;
     size_t loop = len, ctr = cleanse_ctr;
+
+    if (ptr == NULL)
+        return;
+
     while (loop--) {
         *(p++) = (unsigned char)ctr;
         ctr += (17 + ((size_t)p & 0xF));