linux-kernel - RE: [PATCH v1] platform/x86: wmi: Replace kmalloc + sprintf() with kasprintf()

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Date:   Fri, 16 Feb 2018 15:55:24 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Andy Shevchenko' <andriy.shevchenko@...ux.intel.com>,
        Darren Hart <dvhart@...radead.org>,
        "platform-driver-x86@...r.kernel.org" 
        <platform-driver-x86@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v1] platform/x86: wmi: Replace kmalloc + sprintf() with
 kasprintf()

From: Andy Shevchenko
> Sent: 16 February 2018 15:40
>
> kasprintf() does the job of two: kmalloc() and sprintf().
> Replace two calls with one.
...
> -		buf = kmalloc(strlen(wdriver->driver.name) + 5, GFP_KERNEL);
> +		buf = kasprintf(GFP_KERNEL, "wmi/%s", wdriver->driver.name);
...

Except that kasprintf() has no idea how long a buffer is needed.
It might even do the printf twice just to get the length.

	David