linux-kernel - Re: [PATCH] net: stmmac: ensure jumbo_frm error return is correctly checked for -ve value

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:   Sat, 3 Jun 2017 18:55:57 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Colin King <colin.king@...onical.com>
Cc:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        netdev <netdev@...r.kernel.org>, kernel-janitors@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net: stmmac: ensure jumbo_frm error return is correctly
 checked for -ve value

On Fri, Jun 2, 2017 at 5:58 PM, Colin King <colin.king@...onical.com> wrote:
> The current comparison of entry < 0 will never be true since entry is an
> unsigned integer. Cast entry to an int to ensure -ve error return values
> from the call to jumbo_frm are correctly being caught.

>         if (unlikely(is_jumbo) && likely(priv->synopsys_id <
>                                          DWMAC_CORE_4_00)) {
>                 entry = priv->hw->mode->jumbo_frm(tx_q, skb, csum_insertion);
> -               if (unlikely(entry < 0))
> +               if (unlikely((int)entry < 0))

It feels like a hiding some other issue.

-- 
With Best Regards,
Andy Shevchenko