From fc550e95921e109f3778a6b2dc560d63388810ab Mon Sep 17 00:00:00 2001 From: Joe Jin Date: Fri, 7 Jan 2011 18:20:54 +0800 Subject: xen/fb: fix potential memory leak This patch fixes a potential memory leak when xenfb connect to the backend fails. Thanks for Ian's review and comments. [v2: reworded the commit message a bit] Signed-off-by: Konrad Rzeszutek Wilk Signed-off-by: Joe Jin Tested-by: Gurudas Pai Acked-by: Ian Campbell Cc: Jeremy Fitzhardinge Cc: Andrew Morton --- drivers/video/xen-fbfront.c | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-) (limited to 'drivers/video') diff --git a/drivers/video/xen-fbfront.c b/drivers/video/xen-fbfront.c index f92313d33e27..95bbd0a1e5da 100644 --- a/drivers/video/xen-fbfront.c +++ b/drivers/video/xen-fbfront.c @@ -562,26 +562,24 @@ static void xenfb_init_shared_page(struct xenfb_info *info, static int xenfb_connect_backend(struct xenbus_device *dev, struct xenfb_info *info) { - int ret, evtchn; + int ret, evtchn, irq; struct xenbus_transaction xbt; ret = xenbus_alloc_evtchn(dev, &evtchn); if (ret) return ret; - ret = bind_evtchn_to_irqhandler(evtchn, xenfb_event_handler, + irq = bind_evtchn_to_irqhandler(evtchn, xenfb_event_handler, 0, dev->devicetype, info); - if (ret < 0) { + if (irq < 0) { xenbus_free_evtchn(dev, evtchn); xenbus_dev_fatal(dev, ret, "bind_evtchn_to_irqhandler"); - return ret; + return irq; } - info->irq = ret; - again: ret = xenbus_transaction_start(&xbt); if (ret) { xenbus_dev_fatal(dev, ret, "starting transaction"); - return ret; + goto unbind_irq; } ret = xenbus_printf(xbt, dev->nodename, "page-ref", "%lu", virt_to_mfn(info->page)); @@ -603,15 +601,18 @@ static int xenfb_connect_backend(struct xenbus_device *dev, if (ret == -EAGAIN) goto again; xenbus_dev_fatal(dev, ret, "completing transaction"); - return ret; + goto unbind_irq; } xenbus_switch_state(dev, XenbusStateInitialised); + info->irq = irq; return 0; error_xenbus: xenbus_transaction_end(xbt, 1); xenbus_dev_fatal(dev, ret, "writing xenstore"); + unbind_irq: + unbind_from_irqhandler(irq, info); return ret; } -- cgit v1.2.3