cifs: zero out session password before freeing it

cifs: zero out session password before freeing it

...just to be on the safe side.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

fs/cifs/misc.c

@@ -97,7 +97,10 @@ sesInfoFree(struct cifsSesInfo *buf_to_free)
 	kfree(buf_to_free->serverOS);
 	kfree(buf_to_free->serverDomain);
 	kfree(buf_to_free->serverNOS);
-	kfree(buf_to_free->password);
+	if (buf_to_free->password) {
+		memset(buf_to_free->password, 0, strlen(buf_to_free->password));
+		kfree(buf_to_free->password);
+	}
 	kfree(buf_to_free->domainName);
 	kfree(buf_to_free);
 }