linux-kernel - Re: [PATCH] btrfs: fix memdup.cocci warnings

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Message-ID: <CAL3q7H6e7gQWs9X-N4RMxK+UhZKHGxNmP0-q+B6x19uyH9TOwA@mail.gmail.com>
Date:   Tue, 22 Sep 2020 15:05:59 +0100
From:   Filipe Manana <fdmanana@...il.com>
To:     Julia Lawall <julia.lawall@...ia.fr>
Cc:     Filipe Manana <fdmanana@...e.com>,
        Chris Mason <chris.mason@...ionio.com>,
        Josef Bacik <josef@...icpanda.com>,
        David Sterba <dsterba@...e.com>,
        linux-btrfs <linux-btrfs@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        kbuild-all@...ts.01.org
Subject: Re: [PATCH] btrfs: fix memdup.cocci warnings

On Tue, Sep 22, 2020 at 11:29 AM Julia Lawall <julia.lawall@...ia.fr> wrote:
>
> From: kernel test robot <lkp@...el.com>
>
> fs/btrfs/send.c:3854:8-15: WARNING opportunity for kmemdup
>
>  Use kmemdup rather than duplicating its implementation
>
> Generated by: scripts/coccinelle/api/memdup.cocci
>
> Fixes: 28314eb24e6c ("btrfs: send, recompute reference path after orphanization of a directory")
> Signed-off-by: kernel test robot <lkp@...el.com>
> Signed-off-by: Julia Lawall <julia.lawall@...ia.fr>

Since this is not in Linus' tree yet, it can be folded in the original patch.
David, can you do that when you pick it?

Btw, isn't the Fixes tag meant only for bug fixes? This is a pure
cleanup afaics.

Thanks.

> ---
>
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/fdmanana/linux.git misc-next
> head:   28314eb24e6cb8124d1e5da2ef2ccb90ec44cc06
> commit: 28314eb24e6cb8124d1e5da2ef2ccb90ec44cc06 [2/2] btrfs: send, recompute reference path after orphanization of a directory
> :::::: branch date: 17 hours ago
> :::::: commit date: 17 hours ago
>
>
>  send.c |    3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> --- a/fs/btrfs/send.c
> +++ b/fs/btrfs/send.c
> @@ -3851,10 +3851,9 @@ static int refresh_ref_path(struct send_
>         char *name;
>         int ret;
>
> -       name = kmalloc(ref->name_len, GFP_KERNEL);
> +       name = kmemdup(ref->name, ref->name_len, GFP_KERNEL);
>         if (!name)
>                 return -ENOMEM;
> -       memcpy(name, ref->name, ref->name_len);
>
>         fs_path_reset(ref->full_path);
>         ret = get_cur_path(sctx, ref->dir, ref->dir_gen, ref->full_path);



-- 
Filipe David Manana,

“Whether you think you can, or you think you can't — you're right.”