diff --git a/drivers/media/dvb-core/dmxdev.c b/drivers/media/dvb-core/dmxdev.c
index 9ce5f010de3f..6063782e937a 100644
--- a/drivers/media/dvb-core/dmxdev.c
+++ b/drivers/media/dvb-core/dmxdev.c
@@ -731,7 +731,7 @@ static int dvb_dmxdev_filter_start(struct dmxdev_filter *filter)
 		ret = (*secfeed)->allocate_filter(*secfeed, secfilter);
 		if (ret < 0) {
 			dvb_dmxdev_feed_restart(filter);
-			filter->feed.sec->start_filtering(*secfeed);
+			*secfeed = NULL;
 			dprintk("could not get filter\n");
 			return ret;
 		}
diff --git a/drivers/media/dvb-core/dvb_frontend.c b/drivers/media/dvb-core/dvb_frontend.c
index 99192cf7fdc9..33edb68ee289 100644
--- a/drivers/media/dvb-core/dvb_frontend.c
+++ b/drivers/media/dvb-core/dvb_frontend.c
@@ -443,8 +443,8 @@ static int dvb_frontend_swzigzag_autotune(struct dvb_frontend *fe, int check_wra
 
 		default:
 			fepriv->auto_step++;
-			fepriv->auto_sub_step = -1; /* it'll be incremented to 0 in a moment */
-			break;
+			fepriv->auto_sub_step = 0;
+			continue;
 		}
 
 		if (!ready) fepriv->auto_sub_step++;
@@ -679,12 +679,10 @@ static int dvb_frontend_thread(void *data)
 	set_freezable();
 	while (1) {
 		up(&fepriv->sem);	    /* is locked when we enter the thread... */
-restart:
-		wait_event_interruptible_timeout(fepriv->wait_queue,
-						 dvb_frontend_should_wakeup(fe) ||
-						 kthread_should_stop() ||
-						 freezing(current),
-			fepriv->delay);
+		wait_event_freezable_timeout(fepriv->wait_queue,
+					     dvb_frontend_should_wakeup(fe) ||
+					     kthread_should_stop(),
+					     fepriv->delay);
 
 		if (kthread_should_stop() || dvb_frontend_is_exiting(fe)) {
 			/* got signal or quitting */
@@ -694,9 +692,6 @@ restart:
 			break;
 		}
 
-		if (try_to_freeze())
-			goto restart;
-
 		if (down_interruptible(&fepriv->sem))
 			break;
 
@@ -2185,7 +2180,8 @@ static int dvb_frontend_handle_compat_ioctl(struct file *file, unsigned int cmd,
 		if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
 			return -EINVAL;
 
-		tvp = memdup_user(compat_ptr(tvps->props), tvps->num * sizeof(*tvp));
+		tvp = memdup_array_user(compat_ptr(tvps->props),
+					tvps->num, sizeof(*tvp));
 		if (IS_ERR(tvp))
 			return PTR_ERR(tvp);
 
@@ -2216,7 +2212,8 @@ static int dvb_frontend_handle_compat_ioctl(struct file *file, unsigned int cmd,
 		if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
 			return -EINVAL;
 
-		tvp = memdup_user(compat_ptr(tvps->props), tvps->num * sizeof(*tvp));
+		tvp = memdup_array_user(compat_ptr(tvps->props),
+					tvps->num, sizeof(*tvp));
 		if (IS_ERR(tvp))
 			return PTR_ERR(tvp);
 
@@ -2396,7 +2393,8 @@ static int dvb_get_property(struct dvb_frontend *fe, struct file *file,
 	if (!tvps->num || tvps->num > DTV_IOCTL_MAX_MSGS)
 		return -EINVAL;
 
-	tvp = memdup_user((void __user *)tvps->props, tvps->num * sizeof(*tvp));
+	tvp = memdup_array_user((void __user *)tvps->props,
+				tvps->num, sizeof(*tvp));
 	if (IS_ERR(tvp))
 		return PTR_ERR(tvp);
 
@@ -2545,7 +2543,8 @@ static int dvb_frontend_handle_ioctl(struct file *file,
 		if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
 			return -EINVAL;
 
-		tvp = memdup_user((void __user *)tvps->props, tvps->num * sizeof(*tvp));
+		tvp = memdup_array_user((void __user *)tvps->props,
+					tvps->num, sizeof(*tvp));
 		if (IS_ERR(tvp))
 			return PTR_ERR(tvp);
 
diff --git a/drivers/media/dvb-core/dvbdev.c b/drivers/media/dvb-core/dvbdev.c
index 305bb21d843c..9df7c213716a 100644
--- a/drivers/media/dvb-core/dvbdev.c
+++ b/drivers/media/dvb-core/dvbdev.c
@@ -86,10 +86,15 @@ static DECLARE_RWSEM(minor_rwsem);
 static int dvb_device_open(struct inode *inode, struct file *file)
 {
 	struct dvb_device *dvbdev;
+	unsigned int minor = iminor(inode);
+
+	if (minor >= MAX_DVB_MINORS)
+		return -ENODEV;
 
 	mutex_lock(&dvbdev_mutex);
 	down_read(&minor_rwsem);
-	dvbdev = dvb_minors[iminor(inode)];
+
+	dvbdev = dvb_minors[minor];
 
 	if (dvbdev && dvbdev->fops) {
 		int err = 0;
@@ -104,6 +109,8 @@ static int dvb_device_open(struct inode *inode, struct file *file)
 			err = file->f_op->open(inode, file);
 		up_read(&minor_rwsem);
 		mutex_unlock(&dvbdev_mutex);
+		if (err)
+			dvb_device_put(dvbdev);
 		return err;
 	}
 fail:
@@ -488,6 +495,7 @@ int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
 		dvbdevfops = kmemdup(template->fops, sizeof(*dvbdevfops), GFP_KERNEL);
 		if (!dvbdevfops) {
 			kfree(dvbdev);
+			*pdvbdev = NULL;
 			mutex_unlock(&dvbdev_register_lock);
 			return -ENOMEM;
 		}
@@ -496,6 +504,7 @@ int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
 		if (!new_node) {
 			kfree(dvbdevfops);
 			kfree(dvbdev);
+			*pdvbdev = NULL;
 			mutex_unlock(&dvbdev_register_lock);
 			return -ENOMEM;
 		}
@@ -521,7 +530,10 @@ int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
 	for (minor = 0; minor < MAX_DVB_MINORS; minor++)
 		if (!dvb_minors[minor])
 			break;
-	if (minor == MAX_DVB_MINORS) {
+#else
+	minor = nums2minor(adap->num, type, id);
+#endif
+	if (minor >= MAX_DVB_MINORS) {
 		if (new_node) {
 			list_del(&new_node->list_head);
 			kfree(dvbdevfops);
@@ -529,13 +541,12 @@ int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
 		}
 		list_del(&dvbdev->list_head);
 		kfree(dvbdev);
+		*pdvbdev = NULL;
 		up_write(&minor_rwsem);
 		mutex_unlock(&dvbdev_register_lock);
 		return -EINVAL;
 	}
-#else
-	minor = nums2minor(adap->num, type, id);
-#endif
+
 	dvbdev->minor = minor;
 	dvb_minors[minor] = dvb_device_get(dvbdev);
 	up_write(&minor_rwsem);
@@ -551,6 +562,7 @@ int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
 		dvb_media_device_free(dvbdev);
 		list_del(&dvbdev->list_head);
 		kfree(dvbdev);
+		*pdvbdev = NULL;
 		mutex_unlock(&dvbdev_register_lock);
 		return ret;
 	}
@@ -569,6 +581,7 @@ int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
 		dvb_media_device_free(dvbdev);
 		list_del(&dvbdev->list_head);
 		kfree(dvbdev);
+		*pdvbdev = NULL;
 		mutex_unlock(&dvbdev_register_lock);
 		return PTR_ERR(clsdev);
 	}
@@ -949,7 +962,7 @@ int dvb_usercopy(struct file *file,
 		 int (*func)(struct file *file,
 			     unsigned int cmd, void *arg))
 {
-	char    sbuf[128];
+	char    sbuf[128] = {};
 	void    *mbuf = NULL;
 	void    *parg = NULL;
 	int     err  = -EINVAL;
diff --git a/drivers/media/dvb-frontends/cxd2841er.c b/drivers/media/dvb-frontends/cxd2841er.c
index e9d1eef40c62..798da5042136 100644
--- a/drivers/media/dvb-frontends/cxd2841er.c
+++ b/drivers/media/dvb-frontends/cxd2841er.c
@@ -311,12 +311,8 @@ static int cxd2841er_set_reg_bits(struct cxd2841er_priv *priv,
 
 static u32 cxd2841er_calc_iffreq_xtal(enum cxd2841er_xtal xtal, u32 ifhz)
 {
-	u64 tmp;
-
-	tmp = (u64) ifhz * 16777216;
-	do_div(tmp, ((xtal == SONY_XTAL_24000) ? 48000000 : 41000000));
-
-	return (u32) tmp;
+	return div_u64(ifhz * 16777216ull,
+		       (xtal == SONY_XTAL_24000) ? 48000000 : 41000000);
 }
 
 static u32 cxd2841er_calc_iffreq(u32 ifhz)
diff --git a/drivers/media/dvb-frontends/rtl2832.c b/drivers/media/dvb-frontends/rtl2832.c
index 5142820b1b3d..76c3f40443b2 100644
--- a/drivers/media/dvb-frontends/rtl2832.c
+++ b/drivers/media/dvb-frontends/rtl2832.c
@@ -983,7 +983,7 @@ static int rtl2832_pid_filter(struct dvb_frontend *fe, u8 index, u16 pid,
 		index, pid, onoff, dev->slave_ts);
 
 	/* skip invalid PIDs (0x2000) */
-	if (pid > 0x1fff || index > 32)
+	if (pid > 0x1fff || index >= 32)
 		return 0;
 
 	if (onoff)