linux-kernel - [PATCH RESEND] mfd: Fix off-by-one value range checking for tps65910_i2c

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Date:	Mon, 16 May 2011 22:19:01 +0800
From:	Axel Lin <axel.lin@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Graeme Gregory <gg@...mlogic.co.uk>,
	Jorge Eduardo Candelaria <jedu@...mlogic.co.uk>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Liam Girdwood <lrg@...mlogic.co.uk>
Subject: [PATCH RESEND] mfd: Fix off-by-one value range checking for
 tps65910_i2c_write

If bytes == (TPS65910_MAX_REGISTER + 1), we have a buffer overflow when
doing memcpy(&msg[1], src, bytes).

Signed-off-by: Axel Lin <axel.lin@...il.com>
Acked-by: Samuel Ortiz <sameo@...ux.intel.com>
---
 drivers/mfd/tps65910.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/mfd/tps65910.c b/drivers/mfd/tps65910.c
index bf649cf..e318248 100644
--- a/drivers/mfd/tps65910.c
+++ b/drivers/mfd/tps65910.c
@@ -71,7 +71,7 @@ static int tps65910_i2c_write(struct tps65910 *tps65910, u8 reg,
 	u8 msg[TPS65910_MAX_REGISTER + 1];
 	int ret;
 
-	if (bytes > (TPS65910_MAX_REGISTER + 1))
+	if (bytes > TPS65910_MAX_REGISTER)
 		return -EINVAL;
 
 	msg[0] = reg;
-- 
1.7.1



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