netdev - Re: [syzbot] [net?] kernel BUG in set

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Message-ID: <tencent_72742A444FB03378AEE31E7F4C216DC00409@qq.com>
Date: Mon, 20 Oct 2025 14:03:23 +0800
From: "1599101385" <1599101385@...com>
To: "syzbot+be97dd4da14ae88b6ba4@...kaller.appspotmail.com" <syzbot+be97dd4da14ae88b6ba4@...kaller.appspotmail.com>
Cc: "davem@...emloft.net" <davem@...emloft.net>, "edumazet@...gle.com" <edumazet@...gle.com>, "herbert@...dor.apana.org.au" <herbert@...dor.apana.org.au>, "horms@...nel.org" <horms@...nel.org>, "kuba@...nel.org" <kuba@...nel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>, "pabeni@...hat.com" <pabeni@...hat.com>, "steffen.klassert@...unet.com" <steffen.klassert@...unet.com>, "syzkaller-bugs@...glegroups.com" <syzkaller-bugs@...glegroups.com>
Subject: Re: [syzbot] [net?] kernel BUG in set_ipsecrequest

#syz test

From 2edfc8833e43cdf5ccda8bd5be3da5d1bbdc69c6 Mon Sep 17 00:00:00 2001
From: clingfei <1599101385@...com>
Date: Mon, 20 Oct 2025 13:40:35 +0800
Subject: [PATCH] fix integer overflow in set_ipsecrequest
The mp->new_family and mp->old_family is u16, while set_ipsecrequest receives family as uint8_t, 
causing a integer overflow and the later size_req calculation error, which ultimately triggered a 
kernel bug in skb_put.

Reported-by: syzbot+be97dd4da14ae88b6ba4@...kaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=be97dd4da14ae88b6ba4

---
 net/key/af_key.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/key/af_key.c b/net/key/af_key.c
index 2ebde0352245..08f4cde01994 100644
--- a/net/key/af_key.c
+++ b/net/key/af_key.c
@@ -3518,7 +3518,7 @@ static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *

 static int set_ipsecrequest(struct sk_buff *skb,
                            uint8_t proto, uint8_t mode, int level,
-                           uint32_t reqid, uint8_t family,
+                           uint32_t reqid, uint16_t family,
                            const xfrm_address_t *src, const xfrm_address_t *dst)
 {
        struct sadb_x_ipsecrequest *rq;
--
2.34.1