linux-kernel - Re: [PATCH v11 11/12] iio: multiplexer: fix unsigned check with less than zero

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Message-ID: <20170327130653.GA15708@localhost>
Date:   Mon, 27 Mar 2017 15:06:53 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Peter Rosin <peda@...ntia.se>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Wolfram Sang <wsa@...-dreams.de>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Jonathan Corbet <corbet@....net>, linux-i2c@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-iio@...r.kernel.org, linux-doc@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Colin Ian King <colin.king@...onical.com>,
        Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: Re: [PATCH v11 11/12] iio: multiplexer: fix unsigned check with less
 than zero

On Mon, Mar 27, 2017 at 02:17:48PM +0200, Peter Rosin wrote:
> Comparing a size_t with less than zero is always false as size_t
> is unsigned. So, change the type of the variable to ssize_t and
> replicate the size check from mux_configure_channel() into
> mux_write_ext_info() thus ensuring that the size will fit in the
> ssize_t variable.
> 
> Detected by CoverityScan, CID#1415278 ("Unsigned compared against 0")
> 
> Fixes: 1da8e16d2812 ("iio: multiplexer: new iio category and iio-mux driver")

You should fold this one and the next patch into the patches that they
fix up instead fixing stuff that's not yet merged incrementally like you
do here (specifically, the SHA id above will have no matching commit).

Johan