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From:   Kalle Valo <kvalo@codeaurora.org>
To:     Sergey Matyukevich <sergey.matyukevich.os@quantenna.com>
Cc:     Igor Mitsyanko <imitsyanko@quantenna.com>,
        Arnd Bergmann <arnd@arndb.de>,
        Igor Mitsyanko <igor.mitsyanko.os@quantenna.com>,
        Avinash Patil <avinashp@quantenna.com>,
        Sergey Matyukevich <smatyukevich@quantenna.com>,
        "David S. Miller" <davem@davemloft.net>,
        Andrey Shevchenko <ashevchenko@quantenna.com>,
        "linux-wireless\@vger.kernel.org" <linux-wireless@vger.kernel.org>,
        "netdev\@vger.kernel.org" <netdev@vger.kernel.org>,
        "linux-kernel\@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] qtnfmac: avoid uninitialized variable access
References: <20181009155757.494212-1-arnd@arndb.de>
        <20181009202507.xs5bcaq5pi4zcps3@bars>
        <20181010145625.fn2dy2np7e6xxdci@bars>
Date:   Thu, 11 Oct 2018 11:08:38 +0300
In-Reply-To: <20181010145625.fn2dy2np7e6xxdci@bars> (Sergey Matyukevich's
        message of "Wed, 10 Oct 2018 14:56:33 +0000")
Message-ID: <87bm80x5vd.fsf@codeaurora.org>
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Sergey Matyukevich <sergey.matyukevich.os@quantenna.com> writes:

>> > 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@arndb.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@quantenna.com>
>
> Hi Kalle,
>
> Could you please hold back applying this patch for now. We have got
> another report for the same function, this time static analysis tool
> warning. It looks like the patch from Arnd does not cover both cases.
> So we will take a closer look and send a combined fix later.

Ok, I'll drop this from my queue. Please resend whatever patch I need to
apply.

-- 
Kalle Valo