On Mon, 17 Oct 2016 10:00:25 +0200
Geert Uytterhoeven <ge...@linux-m68k.org> wrote:
> Hi Boris,
> On Thu, Oct 13, 2016 at 4:24 PM, Boris Brezillon
> <boris.brezil...@free-electrons.com> wrote:
> > On Thu, 13 Oct 2016 16:05:36 +0200
> > Geert Uytterhoeven <ge...@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 <ge...@linux-m68k.org>
> > One minor comment below, otherwise
> > Reviewed-by: Boris Brezillon <boris.brezil...@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?
> I can do that. However, that moves the call to ubi_get_vid_hdr() _before_
> the call to ubi_io_read_vid_hdr().
> While that would still work (ubi_get_vid_hdr() would just return a pointer to
> the not-yet-read data), I think it's better to not move it, to prevent people
> from accidentally trying to use it before the data has been read.
Well, maybe. I just thought it would be safer to assign it as early as
possible to avoid another 'uninitialized var' bug if move code around
again (which will happen soon ;-)).
Anyway, it's not that important, I'll let Richard take the version
Thanks again for the fix.