[media] drx-j: Be sure that all allocated data are properly initialized

The state struct is allocated without cleaning the memory.
This causes random bugs.

Clean it, and move the memcpy functions just below each kalloc,
to be clearer that all those data are properly filled.

Acked-by: Devin Heitmueller <dheitmueller@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

diff --git a/drivers/media/dvb-frontends/drx39xyj/drx39xxj.c b/drivers/media/dvb-frontends/drx39xyj/drx39xxj.c
index 44e9bafcc9ed32305023d9badd88127f4be0882f..a19547b08b02992a37a02657a1f31f684824f016 100644 (file)
--- a/drivers/media/dvb-frontends/drx39xyj/drx39xxj.c
+++ b/drivers/media/dvb-frontends/drx39xyj/drx39xxj.c
@@ -342,7 +342,7 @@ struct dvb_frontend *drx39xxj_attach(struct i2c_adapter *i2c)
        int result;
 
        /* allocate memory for the internal state */
-       state = kmalloc(sizeof(struct drx39xxj_state), GFP_KERNEL);
+       state = kzalloc(sizeof(struct drx39xxj_state), GFP_KERNEL);
        if (state == NULL)
                goto error;
 
@@ -353,39 +353,38 @@ struct dvb_frontend *drx39xxj_attach(struct i2c_adapter *i2c)
        demod_addr = kmalloc(sizeof(struct i2c_device_addr), GFP_KERNEL);
        if (demod_addr == NULL)
                goto error;
+       memcpy(demod_addr, &drxj_default_addr_g,
+              sizeof(struct i2c_device_addr));
 
        demod_comm_attr = kmalloc(sizeof(struct drx_common_attr), GFP_KERNEL);
        if (demod_comm_attr == NULL)
                goto error;
+       memcpy(demod_comm_attr, &drxj_default_comm_attr_g,
+              sizeof(struct drx_common_attr));
 
        demod_ext_attr = kmalloc(sizeof(struct drxj_data), GFP_KERNEL);
        if (demod_ext_attr == NULL)
                goto error;
+       memcpy(demod_ext_attr, &drxj_data_g, sizeof(struct drxj_data));
 
        /* setup the state */
        state->i2c = i2c;
        state->demod = demod;
 
+       /* setup the demod data */
        memcpy(demod, &drxj_default_demod_g, sizeof(struct drx_demod_instance));
 
        demod->my_i2c_dev_addr = demod_addr;
-       memcpy(demod->my_i2c_dev_addr, &drxj_default_addr_g,
-              sizeof(struct i2c_device_addr));
-       demod->my_i2c_dev_addr->user_data = state;
        demod->my_common_attr = demod_comm_attr;
-       memcpy(demod->my_common_attr, &drxj_default_comm_attr_g,
-              sizeof(struct drx_common_attr));
+       demod->my_i2c_dev_addr->user_data = state;
        demod->my_common_attr->microcode = DRXJ_MC_MAIN;
 #if 0
        demod->my_common_attr->verify_microcode = false;
 #endif
        demod->my_common_attr->verify_microcode = true;
        demod->my_common_attr->intermediate_freq = 5000;
-
        demod->my_ext_attr = demod_ext_attr;
-       memcpy(demod->my_ext_attr, &drxj_data_g, sizeof(struct drxj_data));
-       ((struct drxj_data *)demod->my_ext_attr)->uio_sma_tx_mode = DRX_UIO_MODE_READWRITE;
-
+       ((struct drxj_data *)demod_ext_attr)->uio_sma_tx_mode = DRX_UIO_MODE_READWRITE;
        demod->my_tuner = NULL;
 
        result = drx_open(demod);