from upstream

Index: src/sip_fmt_plug.c
--- src/sip_fmt_plug.c.orig
+++ src/sip_fmt_plug.c
@@ -199,6 +199,8 @@ static void *get_salt(char *ciphertext)
 	char *saltcopy = saltBuf;
 
 	memset(&salt, 0, sizeof(salt));
+	memset(&md5_ctx, 0, sizeof(md5_ctx));
+
 	strcpy(saltBuf, ciphertext);
 	saltcopy += FORMAT_TAG_LEN;	/* skip over "$sip$*" */
 	memset(&login, 0, sizeof(login_t));
