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Message-ID: <53FCAA04.40009@gmail.com> Date: Tue, 26 Aug 2014 23:38:44 +0800 From: Chen Gang <gang.chen.5i5j@...il.com> To: konrad.wilk@...cle.com, boris.ostrovsky@...cle.com, david.vrabel@...rix.com CC: xen-devel@...ts.xenproject.org, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: [PATCH] drivers/xen/grant-table.c: Be sure of unsigned value never comparing with 0 In grow_gnttab_list(), 'i' is 'unsigned int', and 'nr_glist_frames' may be 0 because 'nr_grant_frames' may be 0. So 'i' may never be less than 'nr_glist_frames' in failure processing, which cause infinite looping. Signed-off-by: Chen Gang <gang.chen.5i5j@...il.com> --- drivers/xen/grant-table.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c index c254ae0..be07645 100644 --- a/drivers/xen/grant-table.c +++ b/drivers/xen/grant-table.c @@ -592,8 +592,8 @@ static int grow_gnttab_list(unsigned int more_frames) return 0; grow_nomem: - for ( ; i >= nr_glist_frames; i--) - free_page((unsigned long) gnttab_list[i]); + while (i > nr_glist_frames) + free_page((unsigned long) gnttab_list[--i]); return -ENOMEM; } -- 1.9.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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