From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Fri, 8 Jul 2022 13:00:58 +0000 (+0900)
Subject: resolve: fix heap-buffer-overflow reported by ASAN with strict_string_checks=1
X-Git-Tag: v252-rc1~694^2~1
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=beeab352de413e1c04de0a67ee36525fcf6e99dd;p=thirdparty%2Fsystemd.git

resolve: fix heap-buffer-overflow reported by ASAN with strict_string_checks=1

Fixes #23942.
---

diff --git a/src/resolve/resolved-dns-packet.c b/src/resolve/resolved-dns-packet.c
index 14ce0fe2c86..0e32fb96298 100644
--- a/src/resolve/resolved-dns-packet.c
+++ b/src/resolve/resolved-dns-packet.c
@@ -1389,7 +1389,7 @@ int dns_packet_read_string(DnsPacket *p, char **ret, size_t *start) {
         if (memchr(d, 0, c))
                 return -EBADMSG;
 
-        t = strndup(d, c);
+        t = memdup_suffix0(d, c);
         if (!t)
                 return -ENOMEM;