diff options
| author | David Brownell <david-b@pacbell.net> | 2007-01-17 07:56:26 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-02-08 00:44:38 +0100 |
| commit | 5b89db02a5a7c8bad3c6fb7888778082a441b385 (patch) | |
| tree | 0d9f11ff8cb328fd79dfb77dd8a773cfbb47a366 /drivers/usb | |
| parent | USB: gadgetfs simplifications (diff) | |
| download | linux-5b89db02a5a7c8bad3c6fb7888778082a441b385.tar.xz linux-5b89db02a5a7c8bad3c6fb7888778082a441b385.zip | |
USB: gadgetfs race fix
This resolves a race in gadgetfs associated with changing device/ep0
when processing control requests. The fix is to change that state
earlier, when the control response is issued, so there's no window
in which userspace could see the wrong state; and enlarge the scope
of the spinlock during the ep0 request completion handler.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/gadget/inode.c | 18 |
1 files changed, 11 insertions, 7 deletions
diff --git a/drivers/usb/gadget/inode.c b/drivers/usb/gadget/inode.c index ea8e3160d05e..e5ce4f0bb7cc 100644 --- a/drivers/usb/gadget/inode.c +++ b/drivers/usb/gadget/inode.c @@ -933,28 +933,24 @@ static void clean_req (struct usb_ep *ep, struct usb_request *req) static void ep0_complete (struct usb_ep *ep, struct usb_request *req) { struct dev_data *dev = ep->driver_data; + unsigned long flags; int free = 1; /* for control OUT, data must still get to userspace */ + spin_lock_irqsave(&dev->lock, flags); if (!dev->setup_in) { dev->setup_out_error = (req->status != 0); if (!dev->setup_out_error) free = 0; dev->setup_out_ready = 1; ep0_readable (dev); - } else { - unsigned long flags; - - spin_lock_irqsave(&dev->lock, flags); - if (dev->state == STATE_DEV_SETUP) - dev->state = STATE_DEV_CONNECTED; - spin_unlock_irqrestore(&dev->lock, flags); } /* clean up as appropriate */ if (free && req->buf != &dev->rbuf) clean_req (ep, req); req->complete = epio_complete; + spin_unlock_irqrestore(&dev->lock, flags); } static int setup_req (struct usb_ep *ep, struct usb_request *req, u16 len) @@ -1036,6 +1032,13 @@ ep0_read (struct file *fd, char __user *buf, size_t len, loff_t *ptr) spin_lock_irq (&dev->lock); if (retval) goto done; + + if (dev->state != STATE_DEV_SETUP) { + retval = -ECANCELED; + goto done; + } + dev->state = STATE_DEV_CONNECTED; + if (dev->setup_out_error) retval = -EIO; else { @@ -1187,6 +1190,7 @@ ep0_write (struct file *fd, const char __user *buf, size_t len, loff_t *ptr) if (dev->setup_in) { retval = setup_req (dev->gadget->ep0, dev->req, len); if (retval == 0) { + dev->state = STATE_DEV_CONNECTED; spin_unlock_irq (&dev->lock); if (copy_from_user (dev->req->buf, buf, len)) retval = -EFAULT; |