linux-kernel - [PATCH] m32r: Should index be positive?

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Date:	Sun, 01 Nov 2009 15:33:06 +0100
From:	Roel Kluin <roel.kluin@...il.com>
To:	Hirokazu Takata <takata@...ux-m32r.org>,
	linux-m32r@...linux-m32r.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] m32r: Should index be positive?

Index `ipi_num' is signed, test whether it is negative to
make sure we don't get a negative array element.

Signed-off-by: Roel Kluin <roel.kluin@...il.com>
---
 arch/m32r/kernel/smp.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

Found by code analysis, is it required?

diff --git a/arch/m32r/kernel/smp.c b/arch/m32r/kernel/smp.c
index 8a88f1f..31cef20 100644
--- a/arch/m32r/kernel/smp.c
+++ b/arch/m32r/kernel/smp.c
@@ -806,7 +806,7 @@ unsigned long send_IPI_mask_phys(cpumask_t physid_mask, int ipi_num,
 
 	if (mask & ~physids_coerce(phys_cpu_present_map))
 		BUG();
-	if (ipi_num >= NR_IPIS)
+	if (ipi_num >= NR_IPIS || ipi_num < 0)
 		BUG();
 
 	mask <<= IPI_SHIFT;
--
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