i2c: i801: Don't silently correct invalid transfer size

[ Upstream commit effa453168a7eeb8a562ff4edc1dbf9067360a61 ]

If an invalid block size is provided, reject it instead of silently
changing it to a supported value. Especially critical I see the case of
a write transfer with block length 0. In this case we have no guarantee
that the byte we would write is valid. When silently reducing a read to
32 bytes then we don't return an error and the caller may falsely
assume that we returned the full requested data.

If this change should break any (broken) caller, then I think we should
fix the caller.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/i2c/busses/i2c-i801.c b/drivers/i2c/busses/i2c-i801.c
index efafd028c5d16b0e73d63fcc2dc0749bd94c1250..fb0ddaad87d2e8854f14af0c24f6fad98fc2bcb5 100644 (file)
--- a/drivers/i2c/busses/i2c-i801.c
+++ b/drivers/i2c/busses/i2c-i801.c
@@ -774,6 +774,11 @@ static int i801_block_transaction(struct i801_priv *priv,
        int result = 0;
        unsigned char hostc;
 
+       if (read_write == I2C_SMBUS_READ && command == I2C_SMBUS_BLOCK_DATA)
+               data->block[0] = I2C_SMBUS_BLOCK_MAX;
+       else if (data->block[0] < 1 || data->block[0] > I2C_SMBUS_BLOCK_MAX)
+               return -EPROTO;
+
        if (command == I2C_SMBUS_I2C_BLOCK_DATA) {
                if (read_write == I2C_SMBUS_WRITE) {
                        /* set I2C_EN bit in configuration register */
@@ -787,16 +792,6 @@ static int i801_block_transaction(struct i801_priv *priv,
                }
        }
 
-       if (read_write == I2C_SMBUS_WRITE
-        || command == I2C_SMBUS_I2C_BLOCK_DATA) {
-               if (data->block[0] < 1)
-                       data->block[0] = 1;
-               if (data->block[0] > I2C_SMBUS_BLOCK_MAX)
-                       data->block[0] = I2C_SMBUS_BLOCK_MAX;
-       } else {
-               data->block[0] = 32;    /* max for SMBus block reads */
-       }
-
        /* Experience has shown that the block buffer can only be used for
           SMBus (not I2C) block transactions, even though the datasheet
           doesn't mention this limitation. */