linux-kernel - [patch] xenfb: fix potential memory leak

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Date:	Fri, 07 Jan 2011 18:20:54 +0800
From:	Joe Jin <joe.jin@...cle.com>
To:	jeremy@...p.org, ian.campbell@...rix.com,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	linux-fbdev@...r.kernel.org, xen-devel@...ts.xensource.com,
	gurudas.pai@...cle.com, guru.anbalagane@...cle.com,
	greg.marsden@...cle.com, joe.jin@...cle.com,
	linux-kernel@...r.kernel.org,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: [patch] xenfb: fix potential memory leak

Hi,

This patch fix potential memory leak when xenfb connect backend failed.
Thanks for Ian's review and comments.

Signed-off-by: Joe Jin <joe.jin@...cle.com>
Tested-by: Gurudas Pai <gurudas.pai@...cle.com>
Acked-by: Ian Campbell <ian.campbell@...rix.com>
Cc: Jeremy Fitzhardinge <jeremy@...p.org>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>

---
  xen-fbfront.c |   17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/drivers/video/xen-fbfront.c b/drivers/video/xen-fbfront.c
index dc72563..953334a 100644
--- a/drivers/video/xen-fbfront.c
+++ b/drivers/video/xen-fbfront.c
@@ -561,26 +561,24 @@ 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));
@@ -602,15 +600,18 @@ 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;
 }
 
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