netdev - Re: null pointer at cls

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]

Message-Id: <20100805.130755.57491167.davem@davemloft.net>
Date:	Thu, 05 Aug 2010 13:07:55 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	franchoze@...dex.ru
Cc:	netdev@...r.kernel.org
Subject: Re: null pointer at cls_api.c

From: Franchoze Eric <franchoze@...dex.ru>
Date: Thu, 05 Aug 2010 23:24:15 +0400

> @@ -255,6 +255,11 @@ replay:
>  			kfree(tp);
>  			goto errout;
>  		}
> +
> +		if (!tp || !tp->ops) {
> +			err = -ENOENT;
> +			goto errout;
> +		}
>  		tp->ops = tp_ops;
>  		tp->protocol = protocol;
>  		tp->prio = nprio ? : TC_H_MAJ(tcf_auto_prio(*back));
> 

This patch makes no sense.

We check for "tp"  being non-NULL in the code block about the if() block you're
adding these checks to.

And tp->ops of course might be NULL here, and that's perfectly fine,
as we're about to assign "tp_ops" to it.

Looking at your backtrace I think perhaps your crash is elsewhere.
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html