linux-kernel - Re: [PATCH] iwlwifi: mvm: fix iwl_mvm_sar_find_wifi

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Message-ID: <1498651173.22048.111.camel@coelho.fi>
Date:   Wed, 28 Jun 2017 14:59:33 +0300
From:   Luca Coelho <luca@...lho.fi>
To:     Arnd Bergmann <arnd@...db.de>,
        Johannes Berg <johannes.berg@...el.com>
Cc:     Emmanuel Grumbach <emmanuel.grumbach@...el.com>,
        Intel Linux Wireless <linuxwifi@...el.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        Sara Sharon <sara.sharon@...el.com>,
        Golan Ben-Ami <golan.ben.ami@...el.com>,
        Liad Kaufman <liad.kaufman@...el.com>,
        Haim Dreyfuss <haim.dreyfuss@...el.com>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iwlwifi: mvm: fix iwl_mvm_sar_find_wifi_pkg corner case

On Tue, 2017-06-27 at 17:24 +0200, Arnd Bergmann wrote:
> gcc warns about what it thinks is an uninitialized variable
> access:
> 
> drivers/net/wireless/intel/iwlwifi/mvm/fw.c: In function 'iwl_mvm_sar_find_wifi_pkg.isra.14':
> drivers/net/wireless/intel/iwlwifi/mvm/fw.c:1102:5: error: 'wifi_pkg' may be used uninitialized in this function [-Werror=maybe-uninitialized]
> 
> That problem cannot really happen, as we check data->package.count
> to ensure that the loop is entered at least once.
> However, something that can indeed happen is returning an incorrect
> wifi_pkg pointer in case none of the elements are what we are looking
> for.
> 
> This modifies the loop again, to only return a correct object, and
> to shut up that warning.
> 
> Fixes: c386dacb4ed6 ("iwlwifi: mvm: refactor SAR init to prepare for dynamic SAR")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---

Thanks, Arnd!

I've pushed this to our internal tree and it will eventually reach the
mainline, via our normal upstreaming process.


--
Cheers,
Luca.