linux-kernel - RE: [char-misc v4.4.y 2/2] mei: bus: type promotion bug in mei_nfc_if

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Date:   Sun, 23 Sep 2018 05:49:02 +0000
From:   "Winkler, Tomas" <tomas.winkler@...el.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     "Usyskin, Alexander" <alexander.usyskin@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: RE: [char-misc v4.4.y 2/2] mei: bus: type promotion bug in
 mei_nfc_if_version()

> 
> On Tue, Sep 04, 2018 at 01:43:04AM +0300, Tomas Winkler wrote:
> > From: Dan Carpenter <dan.carpenter@...cle.com>
> >
> > commit b40b3e9358fbafff6a4ba0f4b9658f6617146f9c upstream
> >
> > We accidentally removed the check for negative returns without
> > considering the issue of type promotion.
> > The "if_version_length" variable is type size_t so if __mei_cl_recv()
> > returns a negative then "bytes_recv" is type promoted to a high
> > positive value and treated as success.
> >
> > Cc: <stable@...r.kernel.org> # 4.4
> 
> I also need a version of this patch for 4.18.y, 4.14.y, and 4.9.y before I will
> consider adding it to 4.4.y, as we do not want anyone to ever get a
> regression moving to a new kernel.

Right, I've started from the wrong end. 
Now I've posted the patches for the rest of the required long running versions.

Thanks
Tomas