linux-kernel - Re: [PATCH 10/28] UBI: fix uninitialized access of vid

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Date:   Tue, 18 Oct 2016 07:17:35 +0200
From:   Boris Brezillon <boris.brezillon@...e-electrons.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Artem Bityutskiy <dedekind1@...il.com>,
        Richard Weinberger <richard@....at>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org,
        Brian Norris <computersforpeace@...il.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: Re: [PATCH 10/28] UBI: fix uninitialized access of vid_hdr pointer

Hi Arnd,

On Tue, 18 Oct 2016 00:10:13 +0200
Arnd Bergmann <arnd@...db.de> wrote:

> A rework of UBI that just appeared in linux-next during the merge
> window introduced caused the recover_peb to use a variable that
> is never initialized as seen from this gcc warning:
> 
> drivers/mtd/ubi/eba.c: In function ‘recover_peb’:
> drivers/mtd/ubi/eba.c:744:40: error: ‘vid_hdr’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
> 
> It seems clear that the change to the function arguments was missing
> the initialization that I'm now adding back to restore the
> way the function was working before.

Thanks for the fix, but Geert already sent a patch for this bug a few
days ago.

Regards,

Boris

> 
> Fixes: 3291b52f9ff0 ("UBI: introduce the VID buffer concept")
> Cc: Boris Brezillon <boris.brezillon@...e-electrons.com>
> Cc: Richard Weinberger <richard@....at>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/mtd/ubi/eba.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/mtd/ubi/eba.c b/drivers/mtd/ubi/eba.c
> index 95c4048..2e152be 100644
> --- a/drivers/mtd/ubi/eba.c
> +++ b/drivers/mtd/ubi/eba.c
> @@ -719,7 +719,7 @@ static int try_recover_peb(struct ubi_volume *vol, int pnum, int lnum,
>  			   struct ubi_vid_io_buf *vidb, bool *retry)
>  {
>  	struct ubi_device *ubi = vol->ubi;
> -	struct ubi_vid_hdr *vid_hdr;
> +	struct ubi_vid_hdr *vid_hdr = ubi_get_vid_hdr(vidb);
>  	int new_pnum, err, vol_id = vol->vol_id, data_size;
>  	uint32_t crc;
>