linux-kernel - [PATCH 4.19 25/58] i2c: octeon: check correct size of maximum RECV

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Date:   Mon, 25 Jan 2021 19:39:26 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Robert Richter <rric@...nel.org>,
        Wolfram Sang <wsa@...nel.org>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 25/58] i2c: octeon: check correct size of maximum RECV_LEN packet

From: Wolfram Sang <wsa+renesas@...g-engineering.com>

[ Upstream commit 1b2cfa2d1dbdcc3b6dba1ecb7026a537a1d7277f ]

I2C_SMBUS_BLOCK_MAX defines already the maximum number as defined in the
SMBus 2.0 specs. No reason to add one to it.

Fixes: 886f6f8337dd ("i2c: octeon: Support I2C_M_RECV_LEN")
Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
Reviewed-by: Robert Richter <rric@...nel.org>
Signed-off-by: Wolfram Sang <wsa@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/i2c/busses/i2c-octeon-core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-octeon-core.c b/drivers/i2c/busses/i2c-octeon-core.c
index d9607905dc2f1..845eda70b8cab 100644
--- a/drivers/i2c/busses/i2c-octeon-core.c
+++ b/drivers/i2c/busses/i2c-octeon-core.c
@@ -347,7 +347,7 @@ static int octeon_i2c_read(struct octeon_i2c *i2c, int target,
 		if (result)
 			return result;
 		if (recv_len && i == 0) {
-			if (data[i] > I2C_SMBUS_BLOCK_MAX + 1)
+			if (data[i] > I2C_SMBUS_BLOCK_MAX)
 				return -EPROTO;
 			length += data[i];
 		}
-- 
2.27.0