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From: Axel Lin <axel.lin@gmail.com>
To: linux-kernel <linux-kernel@vger.kernel.org>
Cc: Samuel Ortiz <sameo@linux.intel.com>,
	Todd Fischer <todd.fischer@ridgerun.com>
Subject: [PATCH] mfd: tps6507x - fix off-by-one value range checking
Date: Wed, 13 Oct 2010 10:44:39 +0800	[thread overview]
Message-ID: <1286937879.453.1.camel@mola> (raw)

We use msg[0] for device register.
If bytes == (TPS6507X_MAX_REGISTER + 1),
we got a buffer overflow when doing memcpy(&msg[1], src, bytes);
Thus we must ensure bytes not greater than TPS6507X_MAX_REGISTER.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
---
 drivers/mfd/tps6507x.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/mfd/tps6507x.c b/drivers/mfd/tps6507x.c
index fc01976..33ba772 100644
--- a/drivers/mfd/tps6507x.c
+++ b/drivers/mfd/tps6507x.c
@@ -68,7 +68,7 @@ static int tps6507x_i2c_write_device(struct tps6507x_dev *tps6507x, char reg,
 	u8 msg[TPS6507X_MAX_REGISTER + 1];
 	int ret;
 
-	if (bytes > (TPS6507X_MAX_REGISTER + 1))
+	if (bytes > TPS6507X_MAX_REGISTER)
 		return -EINVAL;
 
 	msg[0] = reg;
-- 
1.7.2




             reply	other threads:[~2010-10-13  2:43 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-10-13  2:44 Axel Lin [this message]
2010-10-19 10:19 ` [PATCH] mfd: tps6507x - fix off-by-one value range checking Samuel Ortiz

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