From 99d51194569f2784261f452ee821c42c3a7a6808 Mon Sep 17 00:00:00 2001
From: Phil Sutter <psutter@redhat.com>
Date: Wed, 6 Oct 2021 17:32:04 +0200
Subject: [PATCH] parser_json: Fix for memleak in tcp option error path
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1999059
Upstream Status: nftables commit f7b0eef8391ae
commit f7b0eef8391ae7f89a3a82f6eeecaebe199224d7
Author: Phil Sutter <phil@nwl.cc>
Date: Fri Jun 11 16:07:02 2021 +0200
parser_json: Fix for memleak in tcp option error path
If 'kind' value is invalid, the function returned without freeing 'expr'
first. Fix this by performing the check before allocation.
Fixes: cb21869649208 ("json: tcp: add raw tcp option match support")
Signed-off-by: Phil Sutter <phil@nwl.cc>
---
src/parser_json.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/src/parser_json.c b/src/parser_json.c
index ef4d4fb..2250be9 100644
--- a/src/parser_json.c
+++ b/src/parser_json.c
@@ -610,12 +610,12 @@ static struct expr *json_parse_tcp_option_expr(struct json_ctx *ctx,
"base", &kind, "offset", &offset, "len", &len)) {
uint32_t flag = 0;
- expr = tcpopt_expr_alloc(int_loc, kind,
- TCPOPT_COMMON_KIND);
-
if (kind < 0 || kind > 255)
return NULL;
+ expr = tcpopt_expr_alloc(int_loc, kind,
+ TCPOPT_COMMON_KIND);
+
if (offset == TCPOPT_COMMON_KIND && len == 8)
flag = NFT_EXTHDR_F_PRESENT;
--
2.31.1