Re: [PATCH 10/28] UBI: fix uninitialized access of vid_hdr pointer

Boris Brezillon
2016-10-18T05:17:46Z

Hi Arnd,

On Tue, 18 Oct 2016 00:10:13 +0200
Arnd Bergmann <arnd@arndb.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@free-electrons.com>
> Cc: Richard Weinberger <richard@nod.at>
> Signed-off-by: Arnd Bergmann <arnd@arndb.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;
>