linux-kernel - Re: Staging: Media: Lirc - Fix possible ERR

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Date:   Tue, 20 Sep 2016 11:45:11 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Shailendra Verma <shailendra.v@...sung.com>
Cc:     Jarod Wilson <jarod@...sonet.com>,
        Mauro Carvalho Chehab <mchehab@....samsung.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-media@...r.kernel.org, devel@...verdev.osuosl.org,
        Ravikant Sharma <ravikant.s2@...sung.com>,
        vidushi.koul@...sung.com, linux-kernel@...r.kernel.org
Subject: Re: Staging: Media: Lirc - Fix possible ERR_PTR() dereferencing.

On Tue, Sep 20, 2016 at 12:21:21PM +0530, Shailendra Verma wrote:
> This is of course wrong to call kfree() if memdup_user() fails,
> no memory was allocated and the error in the error-valued pointer
> should be returned.
> 
> Reviewed-by: Ravikant Sharma <ravikant.s2@...sung.com>
> Signed-off-by: Shailendra Verma <shailendra.v@...sung.com>

Calling kfree(NULL) is fine so there is no bug in the original code.
Also this patch creates a new locking bug.

regards,
dan carpenter