optimize: segfault when releasing unsupported statement

Call xfree() instead since stmt_alloc() does not initialize the
statement type fields.

Closes: https://bugzilla.netfilter.org/show_bug.cgi?id=1609
Fixes: ea1f1c9ff608 ("optimize: memleak in statement matrix")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/optimize.c b/src/optimize.c
index d6dfffec..3a3049d4 100644
--- a/src/optimize.c
+++ b/src/optimize.c
@@ -304,7 +304,7 @@ static int rule_collect_stmts(struct optimize_ctx *ctx, struct rule *rule)
 			clone->nat.type_flags = stmt->nat.type_flags;
 			break;
 		default:
-			stmt_free(clone);
+			xfree(clone);
 			continue;
 		}