RE: [char-misc v4.4.y 2/2] mei: bus: type promotion bug in mei_nfc_if_version()

[Winkler, Tomas]

> 
> On Tue, Sep 04, 2018 at 01:43:04AM +0300, Tomas Winkler wrote:
> > From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
> >
> > 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@xxxxxxxxxxxxxxx> # 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