netdev - Re: [PATCH] sched: Avoid NULL pointer in the function, qdisc_get

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-next>] [day] [month] [year] [list]

Date:	Tue, 26 May 2015 05:31:01 -0400
From:	Jamal Hadi Salim <jhs@...atatu.com>
To:	Nicholas Krause <xerofoify@...il.com>
CC:	davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [PATCH] sched: Avoid NULL pointer in the function, qdisc_get_rtab

On 05/22/15 13:33, Nicholas Krause wrote:

>
> diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
> index ad9eed7..44a8995 100644
> --- a/net/sched/sch_api.c
> +++ b/net/sched/sch_api.c
> @@ -400,7 +400,7 @@ struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, struct nlattr *ta
>   	}
>
>   	rtab = kmalloc(sizeof(*rtab), GFP_KERNEL);
> -	if (rtab) {
> +	if (!rtab) {
>   		rtab->rate = *r;
>   		rtab->refcnt = 1;
>   		memcpy(rtab->data, nla_data(tab), 1024);
>

Did i miss something so clever it is not obvious? ;->
If rtab's kmalloc fails  you want to set rtab's fields?
And what is wrong with returning a null rtab again?

cheers,
jamal
--
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