[PATCH nft 2/4] parser_json: fix several expression memleaks from error path

[Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>]

From: "Sebastian Walz (sivizius)" <sebastian.walz@xxxxxxxxxxx>

Fixes: 586ad210368b ("libnftables: Implement JSON parser")
Signed-off-by: Sebastian Walz (sivizius) <sebastian.walz@xxxxxxxxxxx>
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
---
 src/parser_json.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/parser_json.c b/src/parser_json.c
index fc20fe2969f7..8ca44efbb52e 100644
--- a/src/parser_json.c
+++ b/src/parser_json.c
@@ -1308,6 +1308,7 @@ static struct expr *json_parse_range_expr(struct json_ctx *ctx,
 	expr_high = json_parse_primary_expr(ctx, high);
 	if (!expr_high) {
 		json_error(ctx, "Invalid high value in range expression.");
+		expr_free(expr_low);
 		return NULL;
 	}
 	return range_expr_alloc(int_loc, expr_low, expr_high);
@@ -1889,6 +1890,8 @@ static struct stmt *json_parse_mangle_stmt(struct json_ctx *ctx,
 		return stmt;
 	default:
 		json_error(ctx, "Invalid mangle statement key expression type.");
+		expr_free(key);
+		expr_free(value);
 		return NULL;
 	}
 }
@@ -2888,6 +2891,7 @@ static struct stmt *json_parse_optstrip_stmt(struct json_ctx *ctx,
 	    expr->etype != EXPR_EXTHDR ||
 	    expr->exthdr.op != NFT_EXTHDR_OP_TCPOPT) {
 		json_error(ctx, "Illegal TCP optstrip argument");
+		expr_free(expr);
 		return NULL;
 	}
 
-- 
2.30.2