linux-kernel - Re: [syzbot]

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Message-ID: <67f3de68.050a0220.396535.054f.GAE@google.com>
Date: Mon, 07 Apr 2025 07:17:12 -0700
From: syzbot <syzbot+29fc8991b0ecb186cf40@...kaller.appspotmail.com>
To: contact@...aud-lcm.com
Cc: andrew@...n.ch, contact@...aud-lcm.com, davem@...emloft.net, 
	edumazet@...gle.com, kuba@...nel.org, linux-kernel@...r.kernel.org, 
	linux-ppp@...r.kernel.org, netdev@...r.kernel.org, pabeni@...hat.com, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot]

> Author: contact@...aud-lcm.com
>
> #syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

want either no args or 2 args (repo, branch), got 5

>
> diff --git a/drivers/net/ppp/ppp_synctty.c b/drivers/net/ppp/ppp_synctty.c
> index 644e99fc3623..520d895acc60 100644
> --- a/drivers/net/ppp/ppp_synctty.c
> +++ b/drivers/net/ppp/ppp_synctty.c
> @@ -506,6 +506,11 @@ ppp_sync_txmunge(struct syncppp *ap, struct sk_buff *skb)
>  	unsigned char *data;
>  	int islcp;
>  
> +	/* Ensure we can safely access protocol field and LCP code */
> +	if (!skb || !pskb_may_pull(skb, 3)) {
> +		kfree_skb(skb);
> +		return NULL;
> +	}
>  	data  = skb->data;
>  	proto = get_unaligned_be16(data);