linux-kernel - Re: [PATCH] net: mscc: fix in frame extraction

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] [day] [month] [year] [list]

Message-Id: <20200217.140650.510071134243739795.davem@davemloft.net>
Date:   Mon, 17 Feb 2020 14:06:50 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     horatiu.vultur@...rochip.com
Cc:     alexandre.belloni@...tlin.com, UNGLinuxDriver@...rochip.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: mscc: fix in frame extraction

From: Horatiu Vultur <horatiu.vultur@...rochip.com>
Date: Mon, 17 Feb 2020 09:31:33 +0100

> Each extracted frame on Ocelot has an IFH. The frame and IFH are extracted
> by reading chuncks of 4 bytes from a register.
> 
> In case the IFH and frames were read corretly it would try to read the next
> frame. In case there are no more frames in the queue, it checks if there
> were any previous errors and in that case clear the queue. But this check
> will always succeed also when there are no errors. Because when extracting
> the IFH the error is checked against 4(number of bytes read) and then the
> error is set only if the extraction of the frame failed. So in a happy case
> where there are no errors the err variable is still 4. So it could be
> a case where after the check that there are no more frames in the queue, a
> frame will arrive in the queue but because the error is not reseted, it
> would try to flush the queue. So the frame will be lost.
> 
> The fix consist in resetting the error after reading the IFH.
> 
> Signed-off-by: Horatiu Vultur <horatiu.vultur@...rochip.com>

Applied and queued up for -stable.