[media] cxd2820r: malloc buffers instead of stack

kmalloc I2C buffers

Signed-off-by: Antti Palosaari <crope@iki.fi>
Cc: Dan Carpenter <error27@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 14 insertions, 4 deletions

diff --git a/drivers/media/dvb/frontends/cxd2820r_core.c b/drivers/media/dvb/frontends/cxd2820r_core.c
index 0779f69db793..903cbdbbc73b 100644
--- a/drivers/media/dvb/frontends/cxd2820r_core.c
+++ b/drivers/media/dvb/frontends/cxd2820r_core.c
@@ -740,12 +740,13 @@ static int cxd2820r_tuner_i2c_xfer(struct i2c_adapter *i2c_adap,
         struct i2c_msg msg[], int num)
 {
         struct cxd2820r_priv *priv = i2c_get_adapdata(i2c_adap);
-        u8 obuf[msg[0].len + 2];
+        int ret;
+        u8 *obuf = kmalloc(msg[0].len + 2, GFP_KERNEL);
         struct i2c_msg msg2[2] = {
                 {
                         .addr = priv->cfg.i2c_address,
                         .flags = 0,
-                        .len = sizeof(obuf),
+                        .len = msg[0].len + 2,
                         .buf = obuf,
                 }, {
                         .addr = priv->cfg.i2c_address,
@@ -755,15 +756,24 @@ static int cxd2820r_tuner_i2c_xfer(struct i2c_adapter *i2c_adap,
                 }
         };
 
+        if (!obuf)
+                return -ENOMEM;
+
         obuf[0] = 0x09;
         obuf[1] = (msg[0].addr << 1);
         if (num == 2) { /* I2C read */
                 obuf[1] = (msg[0].addr << 1) | I2C_M_RD; /* I2C RD flag */
-                msg2[0].len = sizeof(obuf) - 1; /* maybe HW bug ? */
+                msg2[0].len = msg[0].len + 2 - 1; /* '-1' maybe HW bug ? */
         }
         memcpy(&obuf[2], msg[0].buf, msg[0].len);
 
-        return i2c_transfer(priv->i2c, msg2, num);
+        ret = i2c_transfer(priv->i2c, msg2, num);
+        if (ret < 0)
+                warn("tuner i2c failed ret:%d", ret);
+
+        kfree(obuf);
+
+        return ret;
 }
 
 static struct i2c_algorithm cxd2820r_tuner_i2c_algo = {