netdev - Re: [PATCH] mt7601u: check memory allocation failure

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:   Mon, 21 Aug 2017 14:41:36 -0700
From:   Jakub Kicinski <kubakici@...pl>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     kvalo@...eaurora.org, matthias.bgg@...il.com,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] mt7601u: check memory allocation failure

On Mon, 21 Aug 2017 14:34:30 -0700, Jakub Kicinski wrote:
> On Mon, 21 Aug 2017 22:59:56 +0200, Christophe JAILLET wrote:
> > Check memory allocation failure and return -ENOMEM in such a case, as
> > already done a few lines below
> > 
> > Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>  
> 
> Acked-by: Jakub Kicinski <kubakici@...pl>

Wait, I take that back.  This code is a bit weird.  We would return an
error, then mt7601u_dma_init() will call mt7601u_free_tx_queue() which
doesn't check for tx_q == NULL condition.

Looks like mt7601u_free_tx() has to check for dev->tx_q == NULL and
return early if that's the case.  Or mt7601u_alloc_tx() should really
clean things up on it's own on failure.  Ugh.