linux-kernel - Re: [PATCH] block: nbd: fix a missing check for nla_nest

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Date:   Fri, 15 Mar 2019 09:27:40 -0400
From:   Josef Bacik <josef@...icpanda.com>
To:     Kangjie Lu <kjlu@....edu>
Cc:     pakki001@....edu, Josef Bacik <josef@...icpanda.com>,
        Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org,
        nbd@...er.debian.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] block: nbd: fix a missing check for nla_nest_start

On Fri, Mar 15, 2019 at 01:31:38AM -0500, Kangjie Lu wrote:
> nla_nest_start may fail and thus deserves a check.
> 
> The fix inserts such a check and exits gracefully in case it
> fails.
> 

Except it won't because we pre-reserve enough space for that attr.  Subsequent
calls could fail, and those are checked properly, but this one won't.  Thanks,

Josef