autofs-5.1.0 - fix memory leak in get_exports()

From: Ian Kent <ikent@redhat.com>

In modules/lookup_hosts.c:get_exports() looping over the returned list of
exports uses the pointer that contains the list. The pointer is updated
in the process of creating the exports multi-mount so a pointer to the
returned list is no longer available to be freed when done.
---
 CHANGELOG              |    1 +
 modules/lookup_hosts.c |   17 +++++++++--------
 2 files changed, 10 insertions(+), 8 deletions(-)

diff --git a/CHANGELOG b/CHANGELOG
index 0cb1d36..2bb0500 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -24,6 +24,7 @@
 - force disable browse mode for amd format maps.
 - fix hosts map options check in lookup_amd_instance().
 - fix memory leak in create_client().
+- fix memory leak in get_exports().
 
 04/06/2014 autofs-5.1.0
 =======================
diff --git a/modules/lookup_hosts.c b/modules/lookup_hosts.c
index ea8f5d6..9d689ff 100644
--- a/modules/lookup_hosts.c
+++ b/modules/lookup_hosts.c
@@ -82,18 +82,19 @@ static char *get_exports(struct autofs_point *ap, const char *host)
 {
 	char buf[MAX_ERR_BUF];
 	char *mapent;
-	exports exp;
+	exports exp, this;
 
 	debug(ap->logopt, MODPREFIX "fetchng export list for %s", host);
 
 	exp = rpc_get_exports(host, 10, 0, RPC_CLOSE_NOLINGER);
 
 	mapent = NULL;
-	while (exp) {
+	this = exp;
+	while (this) {
 		if (mapent) {
 			int len = strlen(mapent) + 1;
 
-			len += strlen(host) + 2*(strlen(exp->ex_dir) + 2) + 3;
+			len += strlen(host) + 2*(strlen(this->ex_dir) + 2) + 3;
 			mapent = realloc(mapent, len);
 			if (!mapent) {
 				char *estr;
@@ -103,10 +104,10 @@ static char *get_exports(struct autofs_point *ap, const char *host)
 				return NULL;
 			}
 			strcat(mapent, " \"");
-			strcat(mapent, exp->ex_dir);
+			strcat(mapent, this->ex_dir);
 			strcat(mapent, "\"");
 		} else {
-			int len = 2*(strlen(exp->ex_dir) + 2) + strlen(host) + 3;
+			int len = 2*(strlen(this->ex_dir) + 2) + strlen(host) + 3;
 
 			mapent = malloc(len);
 			if (!mapent) {
@@ -117,16 +118,16 @@ static char *get_exports(struct autofs_point *ap, const char *host)
 				return NULL;
 			}
 			strcpy(mapent, "\"");
-			strcat(mapent, exp->ex_dir);
+			strcat(mapent, this->ex_dir);
 			strcat(mapent, "\"");
 		}
 		strcat(mapent, " \"");
 		strcat(mapent, host);
 		strcat(mapent, ":");
-		strcat(mapent, exp->ex_dir);
+		strcat(mapent, this->ex_dir);
 		strcat(mapent, "\"");
 
-		exp = exp->ex_next;
+		this = this->ex_next;
 	}
 	rpc_exports_free(exp);