diff options
author | Olivier Sobrie <olivier@sobrie.be> | 2015-01-30 13:22:01 +0100 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2015-02-01 21:33:27 +0100 |
commit | 301d3b7e109e28171d99948467448fd12ebfba06 (patch) | |
tree | bbe20b844856c466f25d6d096e9b010174902c47 /drivers/net/usb | |
parent | hso: move tty_unregister outside hso_serial_common_free() (diff) | |
download | linux-301d3b7e109e28171d99948467448fd12ebfba06.tar.xz linux-301d3b7e109e28171d99948467448fd12ebfba06.zip |
hso: update serial_table in usb disconnect method
The serial_table is used to map the minor number of the usb serial device
to its associated context. The table is updated in the probe method and
in hso_serial_ref_free() which is called either from the tty cleanup
method or from the usb disconnect method.
This patch ensures that the serial_table is updated in the disconnect
method and no more from the cleanup method to avoid the following
potential race condition.
- hso_disconnect() is called for usb interface "x". Because the serial
port was open and because the cleanup method of the tty_port hasn't
been called yet, hso_serial_ref_free() is not run.
- hso_probe() is called and fails for a new hso serial usb interface
"y". The function hso_free_interface() is called and iterates
over the element of serial_table to find the device associated to
the usb interface context.
If the usb interface context of usb interface "y" has been created
at the same place as for usb interface "x", then the cleanup
functions are called for usb interfaces "x" and "y" and
hso_serial_ref_free() is called for both interfaces.
- release_tty() is called for serial port linked to usb interface "x"
and possibly crash because the tty_port structure contained in the
hso_device structure has been freed.
Signed-off-by: Olivier Sobrie <olivier@sobrie.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/usb')
-rw-r--r-- | drivers/net/usb/hso.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c index 5d885888658e..cb33fb4e9a80 100644 --- a/drivers/net/usb/hso.c +++ b/drivers/net/usb/hso.c @@ -2597,7 +2597,6 @@ static void hso_free_serial_device(struct hso_device *hso_dev) if (!serial) return; - set_serial_by_index(serial->minor, NULL); hso_serial_common_free(serial); @@ -3109,6 +3108,7 @@ static void hso_free_interface(struct usb_interface *interface) mutex_unlock(&serial->parent->mutex); hso_serial_tty_unregister(serial); kref_put(&serial_table[i]->ref, hso_serial_ref_free); + set_serial_by_index(i, NULL); } } |