mfd: Fix off-by-one value range checking for tps6507x

If bytes == (TPS6507X_MAX_REGISTER + 1), we have a buffer overflow when
doing memcpy(&msg[1], src, bytes).

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

diff --git a/drivers/mfd/tps6507x.c b/drivers/mfd/tps6507x.c
index fc01976..33ba772 100644 (file)
--- 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;