linux-kernel - Re: [syzbot] [net?] KASAN: slab-out-of-bounds Read in dns_resolver

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Date:   Thu, 14 Dec 2023 06:18:33 -0800
From:   syzbot <syzbot+94bbb75204a05da3d89f@...kaller.appspotmail.com>
To:     linux-kernel@...r.kernel.org
Subject: Re: [syzbot] [net?] KASAN: slab-out-of-bounds Read in dns_resolver_preparse

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Subject: [net?] KASAN: slab-out-of-bounds Read in dns_resolver_preparse
Author: eadavis@...com

please test slab-out-of-bounds Read in dns_resolver_preparse

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git 48e8992e33ab
diff --git a/net/dns_resolver/dns_key.c b/net/dns_resolver/dns_key.c
index 3233f4f25fed..15f19521021c 100644
--- a/net/dns_resolver/dns_key.c
+++ b/net/dns_resolver/dns_key.c
@@ -104,7 +104,7 @@ dns_resolver_preparse(struct key_preparsed_payload *prep)
 
 	if (data[0] == 0) {
 		/* It may be a server list. */
-		if (datalen <= sizeof(*bin))
+		if (datalen <= sizeof(*v1))
 			return -EINVAL;
 
 		bin = (const struct dns_payload_header *)data;