[PATCH] UBI: Fix crash in try_recover_peb()
Boris Brezillon
boris.brezillon at free-electrons.com
Thu Oct 13 07:24:58 PDT 2016
Hi Geert,
On Thu, 13 Oct 2016 16:05:36 +0200
Geert Uytterhoeven <geert at linux-m68k.org> wrote:
> drivers/mtd/ubi/eba.c: In function ‘try_recover_peb’:
> drivers/mtd/ubi/eba.c:744: warning: ‘vid_hdr’ is used uninitialized in this function
>
> The pointer vid_hdr is indeed not initialized, leading to a crash when
> it is dereferenced.
>
> Fix this by obtaining the pointer from the VID buffer, like is done
> everywhere else.
Indeed, I don't know how I missed that one :-/.
>
> Fixes: 3291b52f9ff0acc8 ("UBI: introduce the VID buffer concept")
> Signed-off-by: Geert Uytterhoeven <geert at linux-m68k.org>
One minor comment below, otherwise
Reviewed-by: Boris Brezillon <boris.brezillon at free-electrons.com>
> ---
> Completely untested. And I know nothing about UBI ;-)
> ---
> drivers/mtd/ubi/eba.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/mtd/ubi/eba.c b/drivers/mtd/ubi/eba.c
> index 95c4048a371e87b6..388e46be6ad92805 100644
> --- a/drivers/mtd/ubi/eba.c
> +++ b/drivers/mtd/ubi/eba.c
> @@ -741,6 +741,7 @@ static int try_recover_peb(struct ubi_volume *vol, int pnum, int lnum,
> goto out_put;
> }
>
> + vid_hdr = ubi_get_vid_hdr(vidb);
Can you move this assignment at variable declaration time?
> ubi_assert(vid_hdr->vol_type == UBI_VID_DYNAMIC);
>
> mutex_lock(&ubi->buf_mutex);
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