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

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Message-ID: <68f5ea9f.050a0220.1be48.0009.GAE@google.com>
Date: Mon, 20 Oct 2025 00:54:07 -0700
From: syzbot <syzbot+be97dd4da14ae88b6ba4@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Forwarded: Re: [syzbot] [net?] kernel BUG in set_ipsecrequest

For archival purposes, forwarding an incoming command email to
linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com.

***

Subject: Re: [syzbot] [net?] kernel BUG in set_ipsecrequest
Author: clf700383@...il.com

syzbot <syzbot+be97dd4da14ae88b6ba4@...kaller.appspotmail.com>
于2025年10月20日周一 15:48写道：
>
> Hello,
>
> syzbot tried to test the proposed patch but the build/boot failed:
>
> failed to apply patch:
> checking file net/key/af_key.c
> patch: **** unexpected end of file in patch
>
>
>
> Tested on:
>
> commit:         7361c864 selftests/bpf: Fix list_del() in arena list
> git tree:       bpf-next
> kernel config:  https://syzkaller.appspot.com/x/.config?x=9ad7b090a18654a7
> dashboard link: https://syzkaller.appspot.com/bug?extid=be97dd4da14ae88b6ba4
> compiler:
> patch:          https://syzkaller.appspot.com/x/patch.diff?x=16776b04580000
>

Hi syzbot,

Please test the following patch.

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master

Thanks.

>From 6dc2deb09faf7d53707cc9e75e175b09644fd181 Mon Sep 17 00:00:00 2001
From: clingfei <clf700383@...il.com>
Date: Mon, 20 Oct 2025 13:48:54 +0800
Subject: [PATCH] fix integer overflow in set_ipsecrequest

syzbot reported a kernel BUG in set_ipsecrequest() due to an skb_over_panic.

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 exceeds the size used in alloc_skb, and ultimately triggered the
kernel bug in skb_put.

Reported-by: syzbot+be97dd4da14ae88b6ba4@...kaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=be97dd4da14ae88b6ba4
Signed-off-by: Cheng Lingfei <clf700383@...il.com>
---
 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