libselinux/matchpathcon: RESOURCE_LEAK: Variable "con"

Fixes:
 Error: RESOURCE_LEAK (CWE-772):
 libselinux-3.6/src/matchpathcon.c:519: alloc_arg: "lgetfilecon_raw" allocates memory that is stored into "con". [Note: The source code implementation of the function has been overridden by a user model.]
 libselinux-3.6/src/matchpathcon.c:528: leaked_storage: Variable "con" going out of scope leaks the storage it points to.
 \#  526|
 \#  527|           if (!hnd && (matchpathcon_init_prefix(NULL, NULL) < 0))
 \#  528|->                         return -1;
 \#  529|
 \#  530|           if (selabel_lookup_raw(hnd, &fcontext, path, mode) != 0) {

Signed-off-by: Vit Mojzis <[email protected]>
Acked-by: James Carter <[email protected]>

libselinux/src/matchpathcon.c

@@ -524,8 +524,10 @@ int selinux_file_context_verify(const char *path, mode_t mode)
 			return 0;
 	}
 
-	if (!hnd && (matchpathcon_init_prefix(NULL, NULL) < 0))
+	if (!hnd && (matchpathcon_init_prefix(NULL, NULL) < 0)){
+			freecon(con);
 			return -1;
+	}
 
 	if (selabel_lookup_raw(hnd, &fcontext, path, mode) != 0) {
 		if (errno != ENOENT)