linux-toradex.git/drivers/usb/class/cdc-wdm.c, branch v3.4.2 Linux kernel for Apalis and Colibri modules USB: cdc-wdm: remove from device list on disconnect 2012-06-01T07:18:19+00:00 Bjørn Mork bjorn@mork.no 2012-05-09T11:53:23+00:00 9ed2cb7819e7df0e0fe0cce574c64e57b4806fe1 commit 6286d85e8efdb59252d1ceb99a56fa6b0b11526c upstream. Prevents dereferencing an invalid struct usb_interface pointer. Always delete entry from device list whether or not the rest of the device state cleanup is postponed. The device list uses desc->intf as key, and wdm_open will dereference this key while searching for a matching device. A device should not appear in the list unless probe() has succeeded and disconnect() has not finished. Cc: Oliver Neukum <oliver@neukum.org> Signed-off-by: Bjørn Mork <bjorn@mork.no> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit 6286d85e8efdb59252d1ceb99a56fa6b0b11526c upstream.

Prevents dereferencing an invalid struct usb_interface
pointer.

Always delete entry from device list whether or not the
rest of the device state cleanup is postponed. The device
list uses desc->intf as key, and wdm_open will dereference
this key while searching for a matching device.  A device
should not appear in the list unless probe() has succeeded
and disconnect() has not finished.

Cc: Oliver Neukum <oliver@neukum.org>
Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
USB: cdc-wdm: cannot use dev_printk when device is gone 2012-06-01T07:18:19+00:00 Bjørn Mork bjorn@mork.no 2012-05-09T11:53:22+00:00 577bd3ef6eed18ea3c866b2f25b14aa5e139b41f commit 6b0b79d38806481c1c8fffa7c5842f3c83679a42 upstream. We cannot dereference a removed USB interface for dev_printk. Use pr_debug instead where necessary. Flush errors are expected if device is unplugged and are therefore best ingored at this point. Move the kill_urbs() call in wdm_release with dev_dbg() for the non disconnect, as we know it has already been called if WDM_DISCONNECTING is set. This does not actually fix anything, but keeps the code more consistent. Cc: Oliver Neukum <oliver@neukum.org> Signed-off-by: Bjørn Mork <bjorn@mork.no> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit 6b0b79d38806481c1c8fffa7c5842f3c83679a42 upstream.

We cannot dereference a removed USB interface for
dev_printk. Use pr_debug instead where necessary.

Flush errors are expected if device is unplugged and are
therefore best ingored at this point.

Move the kill_urbs() call in wdm_release with dev_dbg()
for the non disconnect, as we know it has already been
called if WDM_DISCONNECTING is set.  This does not
actually fix anything, but keeps the code more consistent.

Cc: Oliver Neukum <oliver@neukum.org>
Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
USB: cdc-wdm: poll must return POLLHUP if device is gone 2012-06-01T07:18:19+00:00 Bjørn Mork bjorn@mork.no 2012-05-09T11:53:21+00:00 d0765ea47c9ab8466b8765ff768251b572670148 commit 616b6937e348ef2b4c6ea5fef2cd3c441145efb0 upstream. Else the poll will be restarted indefinitely in a tight loop, preventing final device cleanup. Cc: Oliver Neukum <oliver@neukum.org> Signed-off-by: Bjørn Mork <bjorn@mork.no> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit 616b6937e348ef2b4c6ea5fef2cd3c441145efb0 upstream.

Else the poll will be restarted indefinitely in a tight loop,
preventing final device cleanup.

Cc: Oliver Neukum <oliver@neukum.org>
Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
USB: cdc-wdm: fix memory leak 2012-06-01T07:18:18+00:00 Oliver Neukum oliver@neukum.org 2012-04-27T12:36:37+00:00 fccfda602805358246118c8ed991a0cb32160d0f commit 2f338c8a1904e2e7aa5a8bd12fb0cf2422d17da4 upstream. cleanup() is not called if the last close() comes after disconnect(). That leads to a memory leak. Rectified by checking for an earlier disconnect() in release() Signed-off-by: Oliver Neukum <oneukum@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit 2f338c8a1904e2e7aa5a8bd12fb0cf2422d17da4 upstream.

cleanup() is not called if the last close() comes after
disconnect(). That leads to a memory leak. Rectified
by checking for an earlier disconnect() in release()

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
USB: cdc-wdm: sanitize error returns 2012-06-01T07:18:18+00:00 Oliver Neukum oliver@neukum.org 2012-04-27T12:23:54+00:00 eae68611b2683cc1a9a7ca669c60a65020071004 commit 24a85bae5da2b43fed423859c09c5a81ab359473 upstream. wdm_flush() returns unsanitized USB error codes. They must be cleaned up to before being anded to user space Signed-off-by: Oliver Neukum <oneukum@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit 24a85bae5da2b43fed423859c09c5a81ab359473 upstream.

wdm_flush() returns unsanitized USB error codes.
They must be cleaned up to before being anded to user space

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
USB: cdc-wdm: fix race leading leading to memory corruption 2012-04-26T23:59:44+00:00 Oliver Neukum oliver@neukum.org 2012-04-26T19:59:10+00:00 5c22837adca7c30b66121cf18ad3e160134268d4 This patch fixes a race whereby a pointer to a buffer would be overwritten while the buffer was in use leading to a double free and a memory leak. This causes crashes. This bug was introduced in 2.6.34 Signed-off-by: Oliver Neukum <oneukum@suse.de> Tested-by: Bjørn Mork <bjorn@mork.no> Cc: stable <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
This patch fixes a race whereby a pointer to a buffer
would be overwritten while the buffer was in use leading
to a double free and a memory leak. This causes crashes.
This bug was introduced in 2.6.34

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Tested-by: Bjørn Mork <bjorn@mork.no>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
usb: cdc-wdm: adding usb_cdc_wdm_register subdriver support 2012-03-08T21:06:48+00:00 Bjørn Mork bjorn@mork.no 2012-03-06T16:29:22+00:00 3cc3615749dbd1b891512d5c9a5bf4559cfa9741 This driver can be used as a subdriver of another USB driver, allowing it to export a Device Managment interface consisting of a single interrupt endpoint with no dedicated USB interface. Some devices provide a Device Management function combined with a wwan function in a single USB interface having three endpoints (bulk in/out + interrupt). If the interrupt endpoint is used exclusively for DM notifications, then this driver can support that as a subdriver provided that the wwan driver calls the appropriate entry points on probe, suspend, resume, pre_reset, post_reset and disconnect. The main driver must have full control over all interface related settings, including the needs_remote_wakeup flag. A manage_power function must be provided by the main driver. A manage_power stub doing direct flag manipulation is used in normal driver mode. Signed-off-by: Bjørn Mork <bjorn@mork.no> Acked-by: Oliver Neukum <oneukum@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
This driver can be used as a subdriver of another USB driver, allowing
it to export a Device Managment interface consisting of a single interrupt
endpoint with no dedicated USB interface.

Some devices provide a Device Management function combined with a wwan
function in a single USB interface having three endpoints (bulk in/out
+ interrupt).  If the interrupt endpoint is used exclusively for DM
notifications, then this driver can support that as a subdriver
provided that the wwan driver calls the appropriate entry points on
probe, suspend, resume, pre_reset, post_reset and disconnect.

The main driver must have full control over all interface related
settings, including the needs_remote_wakeup flag. A manage_power
function must be provided by the main driver.

A manage_power stub doing direct flag manipulation is used in normal
driver mode.

Signed-off-by: Bjørn Mork <bjorn@mork.no>
Acked-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
usb: cdc-wdm: adding list lookup indirection 2012-03-08T21:06:48+00:00 Bjørn Mork bjorn@mork.no 2012-03-06T16:29:21+00:00 b0c13860808a528cd580fdca61aef9f73352a331 Register all interfaces handled by this driver in a list, getting rid of the dependency on usb_set_intfdata. This allows further generalization and simplification of the probe/create functions. This is needed to decouple wdm_open from the driver owning the interface, and it also allows us to share all the code in wdm_create with drivers unable to do usb_set_intfdata. Signed-off-by: Bjørn Mork <bjorn@mork.no> Acked-by: Oliver Neukum <oneukum@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
Register all interfaces handled by this driver in a list, getting
rid of the dependency on usb_set_intfdata.  This allows further
generalization and simplification of the probe/create functions.

This is needed to decouple wdm_open from the driver owning the
interface, and it also allows us to share all the code in
wdm_create with drivers unable to do usb_set_intfdata.

Signed-off-by: Bjørn Mork <bjorn@mork.no>
Acked-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
usb: cdc-wdm: split out reusable parts of probe 2012-03-08T21:06:48+00:00 Bjørn Mork bjorn@mork.no 2012-03-06T16:29:20+00:00 0dffb4862a5f109dc9b72e3a4e0ecc85a87ce397 Preparing for the addition of subdriver registering as an alternative to probe for interface-less usage. This should not change anything apart from minor code reordering. Signed-off-by: Bjørn Mork <bjorn@mork.no> Acked-by: Oliver Neukum <oneukum@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
Preparing for the addition of subdriver registering as an alternative
to probe for interface-less usage.  This should not change anything
apart from minor code reordering.

Signed-off-by: Bjørn Mork <bjorn@mork.no>
Acked-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
cdc-wdm: Don't clear WDM_READ unless entire read buffer is emptied 2012-02-24T21:12:14+00:00 Ben Hutchings ben@decadent.org.uk 2012-02-12T06:02:43+00:00 b7a205545345578712611106b371538992e142ff The WDM_READ flag is cleared later iff desc->length is reduced to 0. Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Tested-by: Bjørn Mork <bjorn@mork.no> Cc: Oliver Neukum <oliver@neukum.org> Cc: stable <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
The WDM_READ flag is cleared later iff desc->length is reduced to 0.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Tested-by: Bjørn Mork <bjorn@mork.no>
Cc: Oliver Neukum <oliver@neukum.org>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>