From 3f60c1956f3392760d3c969f19f41d4aa653f726 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Bj=C3=B8rn=20Mork?= Date: Mon, 16 Jan 2012 12:41:47 +0100 Subject: [PATCH] USB: cdc-wdm: updating desc->length must be protected by spin_lock MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit commit c428b70c1e115c5649707a602742e34130d19428 upstream. wdm_in_callback() will also touch this field, so we cannot change it without locking Signed-off-by: Bjørn Mork Acked-by: Oliver Neukum Signed-off-by: Greg Kroah-Hartman --- drivers/usb/class/cdc-wdm.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c index efe684908c1f..7e5e82291c01 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); -- 2.39.5