From: Phil Sutter <phil@nwl.cc>
Date: Wed, 13 Sep 2023 20:07:46 +0000 (+0200)
Subject: parser_json: Catch nonsense ops in match statement
X-Git-Tag: v1.0.9~31
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=7df0b2f1a1c64e2bdc652fd2418b4f7218c93f1f;p=thirdparty%2Fnftables.git

parser_json: Catch nonsense ops in match statement

Since expr_op_symbols array includes binary operators and more, simply
checking the given string matches any of the elements is not sufficient.

Fixes: 586ad210368b7 ("libnftables: Implement JSON parser")
Signed-off-by: Phil Sutter <phil@nwl.cc>
---

diff --git a/src/parser_json.c b/src/parser_json.c
index eec73034..c4a09797 100644
--- a/src/parser_json.c
+++ b/src/parser_json.c
@@ -1725,13 +1725,18 @@ static struct stmt *json_parse_match_stmt(struct json_ctx *ctx,
 		    !strcmp(opstr, expr_op_symbols[op]))
 			break;
 	}
-	if (op == __OP_MAX) {
+	switch (op) {
+	case OP_EQ ... OP_NEG:
+		break;
+	case __OP_MAX:
 		if (!strcmp(opstr, "in")) {
 			op = OP_IMPLICIT;
-		} else {
-			json_error(ctx, "Unknown relational op '%s'.", opstr);
-			return NULL;
+			break;
 		}
+		/* fall through */
+	default:
+		json_error(ctx, "Invalid relational op '%s'.", opstr);
+		return NULL;
 	}
 
 	left = json_parse_expr(ctx, jleft);