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authorBen Hutchings <ben@decadent.org.uk>2012-02-12 06:00:41 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-02-24 13:11:56 -0800
commit711c68b3c0f7a924ffbee4aa962d8f62b85188ff (patch)
tree364aa61ad7714ae92264ae06e304fc4fd8171dd0 /drivers/usb/class
parentc192c8e71a2ded01170c1a992cd21aaedc822756 (diff)
cdc-wdm: Fix more races on the read path
We must not allow the input buffer length to change while we're shuffling the buffer contents. We also mustn't clear the WDM_READ flag after more data might have arrived. Therefore move both of these into the spinlocked region at the bottom of wdm_read(). When reading desc->length without holding the iuspin lock, use ACCESS_ONCE() to ensure the compiler doesn't re-read it with inconsistent results. 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>
Diffstat (limited to 'drivers/usb/class')
-rw-r--r--drivers/usb/class/cdc-wdm.c16
1 files changed, 11 insertions, 5 deletions
diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c
index b27bbb957e1..7ca54d4dea9 100644
--- a/drivers/usb/class/cdc-wdm.c
+++ b/drivers/usb/class/cdc-wdm.c
@@ -391,7 +391,7 @@ outnl:
static ssize_t wdm_read
(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
{
- int rv, cntr = 0;
+ int rv, cntr;
int i = 0;
struct wdm_device *desc = file->private_data;
@@ -400,7 +400,8 @@ static ssize_t wdm_read
if (rv < 0)
return -ERESTARTSYS;
- if (desc->length == 0) {
+ cntr = ACCESS_ONCE(desc->length);
+ if (cntr == 0) {
desc->read = 0;
retry:
if (test_bit(WDM_DISCONNECTING, &desc->flags)) {
@@ -455,25 +456,30 @@ retry:
goto retry;
}
clear_bit(WDM_READ, &desc->flags);
+ cntr = desc->length;
spin_unlock_irq(&desc->iuspin);
}
- cntr = count > desc->length ? desc->length : count;
+ if (cntr > count)
+ cntr = count;
rv = copy_to_user(buffer, desc->ubuf, cntr);
if (rv > 0) {
rv = -EFAULT;
goto err;
}
+ spin_lock_irq(&desc->iuspin);
+
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);
+
+ spin_unlock_irq(&desc->iuspin);
+
rv = cntr;
err: