linux-kernel - Re: [PATCH] LLC: Avoid potential NULL dereference in net/llc/af_llc.c::llc_ui

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: Windows password security audit tool. GUI, reports in PDF.

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

Date:	Wed, 01 Nov 2006 16:27:58 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	jesper.juhl@...il.com
Cc:	linux-kernel@...r.kernel.org, jschlst@...ba.org,
	acme@...ectiva.com.br
Subject: Re: [PATCH] LLC: Avoid potential NULL dereference in
 net/llc/af_llc.c::llc_ui_accept() .

From: Jesper Juhl <jesper.juhl@...il.com>
Date: Thu, 2 Nov 2006 01:21:53 +0100

> Since skb_dequeue() may return NULL we risk dereferencing a NULL pointer at
>   if (!skb->sk)
> This patch avoids that by also testing for a NULL skb.
> 
> 
> Signed-off-by: Jesper Juhl <jesper.juhl@...il.com>

It can't return NULL in this context because we just checked
skb_queue_empty() with the socket lock held and llc_wait_data()
will return zero only if skb_queue_empty() is false.

I know it's hard for automated tools to see this, but it's not
reasonable to put this extra check in there since it is
superfluous due to the above mentioned invariants.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/