netdev - Re: [PATCH] ncpfs: memory corruption in ncp_read

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Message-ID: <20180319135612.GA2465@kroah.com>
Date:   Mon, 19 Mar 2018 14:56:13 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     Petr Vandrovec <petr@...drovec.name>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "David S. Miller" <davem@...emloft.net>,
        devel@...verdev.osuosl.org, netdev@...r.kernel.org,
        security@...nel.org
Subject: Re: [PATCH] ncpfs: memory corruption in ncp_read_kernel()

On Mon, Mar 19, 2018 at 02:07:45PM +0300, Dan Carpenter wrote:
> If the server is malicious then *bytes_read could be larger than the
> size of the "target" buffer.  It would lead to memory corruption when we
> do the memcpy().
> 
> Reported-by: Dr Silvio Cesare of InfoSect <Silvio Cesare <silvio.cesare@...il.com>
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
> 
> diff --git a/drivers/staging/ncpfs/ncplib_kernel.c b/drivers/staging/ncpfs/ncplib_kernel.c
> index 804adfebba2f..3e047eb4cc7c 100644
> --- a/drivers/staging/ncpfs/ncplib_kernel.c
> +++ b/drivers/staging/ncpfs/ncplib_kernel.c

Ugh, I have like 2 more months before I delete this code :)

Anyway, nice find, and fix, I'll go queue it up now, thanks.

greg k-h