Re: [syzbot] [net?] kernel BUG in set_ipsecrequest

[syzbot <syzbot+be97dd4da14ae88b6ba4@syzkaller.appspotmail.com>]

> #syz test:

want either no args or 2 args (repo, branch), got 7

> From 2edfc8833e43cdf5ccda8bd5be3da5d1bbdc69c6 Mon Sep 17 00:00:00 2001
> From: clingfei <1599101385@qq.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@syzkaller.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