linux-kernel - Re: [PATCH] qtnfmac: avoid uninitialized variable access

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Date:   Tue, 9 Oct 2018 20:25:16 +0000
From:   Sergey Matyukevich <sergey.matyukevich.os@...ntenna.com>
To:     Arnd Bergmann <arnd@...db.de>
CC:     Igor Mitsyanko <imitsyanko@...ntenna.com>,
        Igor Mitsyanko <igor.mitsyanko.os@...ntenna.com>,
        Avinash Patil <avinashp@...ntenna.com>,
        Sergey Matyukevich <smatyukevich@...ntenna.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        Andrey Shevchenko <ashevchenko@...ntenna.com>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] qtnfmac: avoid uninitialized variable access

Hello Arnd,

> When qtnf_trans_send_cmd_with_resp() fails, we have not yet initialized
> 'resp', as pointed out by a valid gcc warning:
> 
> drivers/net/wireless/quantenna/qtnfmac/commands.c: In function 'qtnf_cmd_send_with_reply':
> drivers/net/wireless/quantenna/qtnfmac/commands.c:133:54: error: 'resp' may be used uninitialized in this function [-Werror=maybe-uninitialized]
> 
> Since 'resp_skb' is also not set here, we can skip all further
> processing and just print the warning and return the failure code.
> 
> Fixes: c6ed298ffe09 ("qtnfmac: cleanup and unify command error handling")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Thanks for the patch! And for reminding me that I forgot to enable
gcc warnings in CI builds in addition to sparse checks.

Reviewed-by: Sergey Matyukevich <sergey.matyukevich.os@...ntenna.com>

Regards,
Sergey