linux-kernel - Re: [PATCH] platform/x86: alienware-wmi: fix kfree on potentially uninitialized pointer

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Message-ID: <20190403220200.GC39081@wrath>
Date:   Wed, 3 Apr 2019 15:02:00 -0700
From:   Darren Hart <dvhart@...radead.org>
To:     Colin King <colin.king@...onical.com>
Cc:     Andy Shevchenko <andy@...radead.org>,
        platform-driver-x86@...r.kernel.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] platform/x86: alienware-wmi: fix kfree on potentially
 uninitialized pointer

On Sat, Mar 30, 2019 at 12:17:12AM +0000, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> Currently the kfree of output.pointer can be potentially freeing
> an uninitalized pointer in the case where out_data is NULL. Fix this
> by reworking the case where out_data is not-null to perform the
> ACPI status check and also the kfree of outpoint.pointer in one block
> and hence ensuring the pointer is only freed when it has been used.
> 
> Also replace the if (ptr != NULL) idiom with just if (ptr).
> 
> Fixes: ff0e9f26288d ("platform/x86: alienware-wmi: Correct a memory leak")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

Thanks for the catch Colin, queued for testing.

Did you trigger this error or detect it via review or static analysis?

-- 
Darren Hart
VMware Open Source Technology Center