linux-kernel - Re: [PATCH] s390/hmcdrv: Replace kmalloc() + copy_from_user() with memdup_user

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Message-ID: <90bd7438-f683-4b1f-b798-1fe7cdb0eab2-agordeev@linux.ibm.com>
Date: Mon, 8 Sep 2025 13:50:27 +0200
From: Alexander Gordeev <agordeev@...ux.ibm.com>
To: Thorsten Blum <thorsten.blum@...ux.dev>
Cc: Heiko Carstens <hca@...ux.ibm.com>, Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>, Jan Kara <jack@...e.cz>,
        Christian Brauner <brauner@...nel.org>,
        Jeff Layton <jlayton@...nel.org>, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] s390/hmcdrv: Replace kmalloc() + copy_from_user() with
 memdup_user_nul()

On Fri, Sep 05, 2025 at 01:02:23PM +0200, Thorsten Blum wrote:
> Replace kmalloc() followed by copy_from_user() with memdup_user_nul() to
> improve and simplify hmcdrv_dev_write(). Remove the manual
> NUL-termination.
> 
> No functional changes intended.
> 
> Signed-off-by: Thorsten Blum <thorsten.blum@...ux.dev>
> ---
>  drivers/s390/char/hmcdrv_dev.c | 19 ++++++-------------
>  1 file changed, 6 insertions(+), 13 deletions(-)

Applied, thanks!