diff options
| author | Bjørn Mork <bjorn@mork.no> | 2012-01-16 12:41:47 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-02-03 09:18:59 -0800 |
| commit | 906e114c35cd8f98be1f672a2f32c0cf9800296b (patch) | |
| tree | 1edf082fe65da1e000c5bd2dbf3a503217974a1f | |
| parent | 3b09a4eb286bdc9dbc4c9620faa562c8470b2366 (diff) | |
USB: cdc-wdm: updating desc->length must be protected by spin_lock
commit c428b70c1e115c5649707a602742e34130d19428 upstream.
wdm_in_callback() will also touch this field, so we cannot change it without locking
Signed-off-by: Bjørn Mork <bjorn@mork.no>
Acked-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/usb/class/cdc-wdm.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c index 2b9ff518b509..bac7478f517a 100644 --- a/drivers/usb/class/cdc-wdm.c +++ b/drivers/usb/class/cdc-wdm.c @@ -467,7 +467,9 @@ retry: for (i = 0; i < desc->length - cntr; i++) desc->ubuf[i] = desc->ubuf[i + cntr]; + spin_lock_irq(&desc->iuspin); desc->length -= cntr; + spin_unlock_irq(&desc->iuspin); /* in case we had outstanding data */ if (!desc->length) clear_bit(WDM_READ, &desc->flags); |