upstream commit

Plug some mem leaks mostly on error paths.  From jjelen
at redhat.com via bz#2687, ok djm@

Upstream-ID: 3fb030149598957a51b7c8beb32bf92cf30c96f2

1 files changed, 12 insertions, 5 deletions

diff --git a/kex.c b/kex.c
index a30dabe5..5b42518d 100644
--- a/kex.c
+++ b/kex.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: kex.c,v 1.128 2017/02/03 23:01:19 djm Exp $ */
+/* $OpenBSD: kex.c,v 1.129 2017/03/10 03:45:40 dtucker Exp $ */
 /*
  * Copyright (c) 2000, 2001 Markus Friedl.  All rights reserved.
  *
@@ -178,7 +178,7 @@ kex_names_valid(const char *names)
 char *
 kex_names_cat(const char *a, const char *b)
 {
-	char *ret = NULL, *tmp = NULL, *cp, *p;
+	char *ret = NULL, *tmp = NULL, *cp, *p, *m;
 	size_t len;
 
 	if (a == NULL || *a == '\0')
@@ -195,8 +195,10 @@ kex_names_cat(const char *a, const char *b)
 	}
 	strlcpy(ret, a, len);
 	for ((p = strsep(&cp, ",")); p && *p != '\0'; (p = strsep(&cp, ","))) {
-		if (match_list(ret, p, NULL) != NULL)
+		if ((m = match_list(ret, p, NULL)) != NULL) {
+			free(m);
 			continue; /* Algorithm already present */
+		}
 		if (strlcat(ret, ",", len) >= len ||
 		    strlcat(ret, p, len) >= len) {
 			free(tmp);
@@ -651,8 +653,10 @@ choose_enc(struct sshenc *enc, char *client, char *server)
 
 	if (name == NULL)
 		return SSH_ERR_NO_CIPHER_ALG_MATCH;
-	if ((enc->cipher = cipher_by_name(name)) == NULL)
+	if ((enc->cipher = cipher_by_name(name)) == NULL) {
+		free(name);
 		return SSH_ERR_INTERNAL_ERROR;
+	}
 	enc->name = name;
 	enc->enabled = 0;
 	enc->iv = NULL;
@@ -670,8 +674,10 @@ choose_mac(struct ssh *ssh, struct sshmac *mac, char *client, char *server)
 
 	if (name == NULL)
 		return SSH_ERR_NO_MAC_ALG_MATCH;
-	if (mac_setup(mac, name) < 0)
+	if (mac_setup(mac, name) < 0) {
+		free(name);
 		return SSH_ERR_INTERNAL_ERROR;
+	}
 	/* truncate the key */
 	if (ssh->compat & SSH_BUG_HMAC)
 		mac->key_len = 16;
@@ -695,6 +701,7 @@ choose_comp(struct sshcomp *comp, char *client, char *server)
 	} else if (strcmp(name, "none") == 0) {
 		comp->type = COMP_NONE;
 	} else {
+		free(name);
 		return SSH_ERR_INTERNAL_ERROR;
 	}
 	comp->name = name;