linux-kernel - Re: [PATCH] ide: don't call memcpy with the same source and destination

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Message-id: <3967489.2j6es1sVNT@amdc3058>
Date:   Tue, 18 Apr 2017 12:58:27 +0200
From:   Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:     Mikulas Patocka <mpatocka@...hat.com>
Cc:     "David S. Miller" <davem@...emloft.net>, linux-ide@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        "James E.J. Bottomley" <jejb@...isc-linux.org>,
        Helge Deller <deller@....de>,
        John David Anglin <dave.anglin@...l.net>,
        linux-parisc@...r.kernel.org
Subject: Re: [PATCH] ide: don't call memcpy with the same source and destination


On Friday, April 14, 2017 02:35:33 PM Mikulas Patocka wrote:
> The parisc architecture recently reimplemented the memcpy function and
> their reimplementation crashed when source and destination overlapped.
> 
> The crash happened in the function ide_complete_cmd where memcpy is called
> with the same source and destination pointer. According to the C
> specification, memcpy behavior is undefined if the source and destination
> range overlaps. This patches fixes the undefined behavior.
> 
> Signed-off-by: Mikulas Patocka <mpatocka@...hat.com>

Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics