From: Christoph Hellwig <hch@infradead.org>
To: Dave Chinner <david@fromorbit.com>
Cc: xfs@oss.sgi.com
Subject: Re: [PATCH 2/5] repair: fix some valgrind reported errors on i686
Date: Sun, 9 Oct 2011 19:45:29 -0400 [thread overview]
Message-ID: <20111009234529.GA13527@infradead.org> (raw)
In-Reply-To: <1318201910-11144-3-git-send-email-david@fromorbit.com>
On Mon, Oct 10, 2011 at 10:11:47AM +1100, Dave Chinner wrote:
> From: Dave Chinner <dchinner@redhat.com>
>
> Fix a potential prefetch read problem due to the first loop
> execution of pf_batch_read potentially not initialising the fsbno
> varaible:
variable.
>
> ==10177== Thread 6:
> ==10177== Conditional jump or move depends on uninitialised value(s)
> ==10177== at 0x8079CAB: pf_batch_read (prefetch.c:408)
> ==10177== by 0x6A2996D: clone (clone.S:130)
> ==10177==
>
> Signed-off-by: Dave Chinner <dchinner@redhat.com>
> ---
> repair/prefetch.c | 2 +-
> 1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/repair/prefetch.c b/repair/prefetch.c
> index d2fdf90..da074a8 100644
> --- a/repair/prefetch.c
> +++ b/repair/prefetch.c
> @@ -397,7 +397,7 @@ pf_batch_read(
> int len, size;
> int i;
> int inode_bufs;
> - unsigned long fsbno;
> + unsigned long fsbno = 0;
Call me stupid, but I can't see how this could actually be a real
life issue. The first thing we do in the loop is to to write
to fsbno in btree_find. I'm fine adding this to shut up warnins,
but I can't see a real issue.
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next prev parent reply other threads:[~2011-10-09 23:45 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-09 23:11 [PATCH 0/5, v2] repair: sector size and blkmap fixes Dave Chinner
2011-10-09 23:11 ` [PATCH 1/5] repair: handle repair of image files on large sector size filesystems Dave Chinner
2011-10-09 23:52 ` Christoph Hellwig
2011-10-10 0:17 ` Dave Chinner
2011-10-10 0:19 ` Christoph Hellwig
2011-10-09 23:11 ` [PATCH 2/5] repair: fix some valgrind reported errors on i686 Dave Chinner
2011-10-09 23:45 ` Christoph Hellwig [this message]
2011-10-10 0:20 ` Dave Chinner
2011-10-10 13:14 ` Christoph Hellwig
2011-10-09 23:11 ` [PATCH 3/5] repair: handle memory allocation failure from blkmap_grow Dave Chinner
2011-10-09 23:51 ` Christoph Hellwig
2011-10-10 0:10 ` Dave Chinner
2011-10-09 23:11 ` [PATCH 4/5] repair: don't cache large blkmap allocations Dave Chinner
2011-10-09 23:48 ` Christoph Hellwig
2011-10-10 0:14 ` Dave Chinner
2011-10-10 13:22 ` Christoph Hellwig
2011-10-09 23:11 ` [PATCH 5/5] repair: prevent blkmap extent count overflows Dave Chinner
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