linux-kernel - Re: [PATCH] fat: Use pointer to d_name[0] in put

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Message-ID: <886cb762-2532-c170-d615-d7ddf1e1561c@gmx.de>
Date:   Mon, 14 Feb 2022 11:13:56 +0100
From:   Helge Deller <deller@....de>
To:     Andreas Schwab <schwab@...ux-m68k.org>,
        David Laight <David.Laight@...LAB.COM>
Cc:     OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "linux-parisc@...r.kernel.org" <linux-parisc@...r.kernel.org>
Subject: Re: [PATCH] fat: Use pointer to d_name[0] in put_user() for compat
 case

On 2/14/22 10:27, Andreas Schwab wrote:
> On Feb 14 2022, David Laight wrote:
>
>> The 'bug' is caused by put_user() trying to do:
>> 	__typeof__(ptr) __ptr = ptr;
>> where __typeof__ is returning char[n] not char *.
>>
>> I've tried a few things but can't get __typeof__ to
>> generate a suitable type for both a simple type and array.
>
> Does it work to use __typeof__(&*(ptr))?

Yes, this works.

Helge