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staging: most: hdm-usb: fix mbo buffer leak

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This patch fixes an MBO leak by replacing the proprietary
free_anchored_buffers() function with the usb_kill_anchored_urbs() function
of the USB subsystem and guarantees that the mbo->complete() completion
function is being called for each URB.

Signed-off-by: Andrey Shvetsov <andrey.shvetsov@k2l.de>
Signed-off-by: Christian Gromm <christian.gromm@microchip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andrey Shvetsov 2016-10-04 17:10:21 +02:00 committed by Greg Kroah-Hartman
parent 02245b6077
commit 3a542007fd
1 changed files with 25 additions and 60 deletions
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85
drivers/staging/most/hdm-usb/hdm_usb.c
View file

@ -182,30 +182,6 @@ static inline int drci_wr_reg(struct usb_device *dev, u16 reg, u16 data)
5 * HZ);
}
/**
* free_anchored_buffers - free device's anchored items
* @mdev: the device
* @channel: channel ID
* @status: status of MBO termination
*/
static void free_anchored_buffers(struct most_dev *mdev, unsigned int channel,
enum mbo_status_flags status)
{
struct mbo *mbo;
struct urb *urb;
while ((urb = usb_get_from_anchor(&mdev->busy_urbs[channel]))) {
mbo = urb->context;
usb_kill_urb(urb);
if (mbo && mbo->complete) {
mbo->status = status;
mbo->processed_length = 0;
mbo->complete(mbo);
}
usb_free_urb(urb);
}
}
/**
* get_stream_frame_size - calculate frame size of current configuration
* @cfg: channel configuration
@ -274,7 +250,7 @@ static int hdm_poison_channel(struct most_interface *iface, int channel)
cancel_work_sync(&mdev->clear_work[channel].ws);
mutex_lock(&mdev->io_mutex);
free_anchored_buffers(mdev, channel, MBO_E_CLOSE);
usb_kill_anchored_urbs(&mdev->busy_urbs[channel]);
if (mdev->padding_active[channel])
mdev->padding_active[channel] = false;
@ -373,33 +349,27 @@ static void hdm_write_completion(struct urb *urb)
unsigned long flags;
spin_lock_irqsave(lock, flags);
if (urb->status == -ENOENT || urb->status == -ECONNRESET ||
!mdev->is_channel_healthy[channel]) {
spin_unlock_irqrestore(lock, flags);
return;
}
if (unlikely(urb->status && urb->status != -ESHUTDOWN)) {
mbo->processed_length = 0;
mbo->processed_length = 0;
mbo->status = MBO_E_INVAL;
if (likely(mdev->is_channel_healthy[channel])) {
switch (urb->status) {
case 0:
case -ESHUTDOWN:
mbo->processed_length = urb->actual_length;
mbo->status = MBO_SUCCESS;
break;
case -EPIPE:
dev_warn(dev, "Broken OUT pipe detected\n");
mdev->is_channel_healthy[channel] = false;
spin_unlock_irqrestore(lock, flags);
mdev->clear_work[channel].pipe = urb->pipe;
schedule_work(&mdev->clear_work[channel].ws);
return;
break;
case -ENODEV:
case -EPROTO:
mbo->status = MBO_E_CLOSE;
break;
default:
mbo->status = MBO_E_INVAL;
break;
}
} else {
mbo->status = MBO_SUCCESS;
mbo->processed_length = urb->actual_length;
}
spin_unlock_irqrestore(lock, flags);
@ -527,40 +497,35 @@ static void hdm_read_completion(struct urb *urb)
unsigned long flags;
spin_lock_irqsave(lock, flags);
if (urb->status == -ENOENT || urb->status == -ECONNRESET ||
!mdev->is_channel_healthy[channel]) {
spin_unlock_irqrestore(lock, flags);
return;
}
if (unlikely(urb->status && urb->status != -ESHUTDOWN)) {
mbo->processed_length = 0;
mbo->processed_length = 0;
mbo->status = MBO_E_INVAL;
if (likely(mdev->is_channel_healthy[channel])) {
switch (urb->status) {
case 0:
case -ESHUTDOWN:
mbo->processed_length = urb->actual_length;
mbo->status = MBO_SUCCESS;
if (mdev->padding_active[channel] &&
hdm_remove_padding(mdev, channel, mbo)) {
mbo->processed_length = 0;
mbo->status = MBO_E_INVAL;
}
break;
case -EPIPE:
dev_warn(dev, "Broken IN pipe detected\n");
mdev->is_channel_healthy[channel] = false;
spin_unlock_irqrestore(lock, flags);
mdev->clear_work[channel].pipe = urb->pipe;
schedule_work(&mdev->clear_work[channel].ws);
return;
break;
case -ENODEV:
case -EPROTO:
mbo->status = MBO_E_CLOSE;
break;
case -EOVERFLOW:
dev_warn(dev, "Babble on IN pipe detected\n");
default:
mbo->status = MBO_E_INVAL;
break;
}
} else {
mbo->processed_length = urb->actual_length;
mbo->status = MBO_SUCCESS;
if (mdev->padding_active[channel] &&
hdm_remove_padding(mdev, channel, mbo)) {
mbo->processed_length = 0;
mbo->status = MBO_E_INVAL;
}
}
spin_unlock_irqrestore(lock, flags);
@ -827,7 +792,7 @@ static void wq_clear_halt(struct work_struct *wq_obj)
mutex_lock(&mdev->io_mutex);
most_stop_enqueue(&mdev->iface, channel);
free_anchored_buffers(mdev, channel, MBO_E_INVAL);
usb_kill_anchored_urbs(&mdev->busy_urbs[channel]);
if (usb_clear_halt(mdev->usb_device, pipe))
dev_warn(&mdev->usb_device->dev, "Failed to reset endpoint.\n");