[lustre-devel] [PATCH] staging: lustre: lov: Fix signed wrap around when decrementing index 'i'
Dilger, Andreas
andreas.dilger at intel.com
Thu Nov 10 14:31:08 PST 2016
On Nov 10, 2016, at 07:19, Colin King <colin.king at canonical.com> wrote:
>
> From: Colin Ian King <colin.king at canonical.com>
>
> Change predecrement compare to post decrement compare to avoid an
> unsigned integer wrap-around comparisomn when decrementing in the while
> loop.
>
> Issue found with static analysis with CoverityScan, CID 1375917
Thanks for the patch. Seems this change has gotten a lot of attention,
this is the third patch to the list to fix it. My preference is to
undo the int->unsigned declaration change, for which James has already
submitted a patch.
Cheers, Andreas
> Signed-off-by: Colin Ian King <colin.king at canonical.com>
> ---
> drivers/staging/lustre/lustre/lov/lov_ea.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/staging/lustre/lustre/lov/lov_ea.c b/drivers/staging/lustre/lustre/lov/lov_ea.c
> index 53db170..399298c 100644
> --- a/drivers/staging/lustre/lustre/lov/lov_ea.c
> +++ b/drivers/staging/lustre/lustre/lov/lov_ea.c
> @@ -102,7 +102,7 @@ struct lov_stripe_md *lsm_alloc_plain(u16 stripe_count)
> return lsm;
>
> err:
> - while (--i >= 0)
> + while (i-- > 0)
> kmem_cache_free(lov_oinfo_slab, lsm->lsm_oinfo[i]);
> kvfree(lsm);
> return NULL;
> --
> 2.10.2
>
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