mfd: Fix off-by-one value range checking for tps65912_i2c_write

If bytes == (TPS6591X_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/tps65912-i2c.c b/drivers/mfd/tps65912-i2c.c
index 9ed123aa662416f30286134812df99e41f6d4917..c041f2c3d2bdd01190fd7bbc72d17acb6228c51f 100644 (file)
--- a/drivers/mfd/tps65912-i2c.c
+++ b/drivers/mfd/tps65912-i2c.c
@@ -57,7 +57,7 @@ static int tps65912_i2c_write(struct tps65912 *tps65912, u8 reg,
        u8 msg[TPS6591X_MAX_REGISTER + 1];
        int ret;
 
-       if (bytes > (TPS6591X_MAX_REGISTER + 1))
+       if (bytes > TPS6591X_MAX_REGISTER)
                return -EINVAL;
 
        msg[0] = reg;