netdev - Re: [PATCH net] atm: clip: prevent NULL deref in clip

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <20250621105348.GC71935@horms.kernel.org>
Date: Sat, 21 Jun 2025 11:53:48 +0100
From: Simon Horman <horms@...nel.org>
To: Eric Dumazet <edumazet@...gle.com>
Cc: "David S. Miller" <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org, eric.dumazet@...il.com,
	syzbot+1316233c4c6803382a8b@...kaller.appspotmail.com,
	Cong Wang <xiyou.wangcong@...il.com>,
	Gengming Liu <l.dmxcsnsbh@...il.com>
Subject: Re: [PATCH net] atm: clip: prevent NULL deref in clip_push()

On Fri, Jun 20, 2025 at 02:28:44PM +0000, Eric Dumazet wrote:
> Blamed commit missed that vcc_destroy_socket() calls
> clip_push() with a NULL skb.
> 
> If clip_devs is NULL, clip_push() then crashes when reading
> skb->truesize.
> 
> Fixes: 93a2014afbac ("atm: fix a UAF in lec_arp_clear_vccs()")
> Reported-by: syzbot+1316233c4c6803382a8b@...kaller.appspotmail.com
> Closes: https://lore.kernel.org/netdev/68556f59.a00a0220.137b3.004e.GAE@google.com/T/#u
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Cc: Cong Wang <xiyou.wangcong@...il.com>
> Cc: Gengming Liu <l.dmxcsnsbh@...il.com>

Reviewed-by: Simon Horman <horms@...nel.org>