linux-kernel - [PATCH] xenbus: don't free other end details too early

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Date:	Mon, 05 Mar 2012 17:11:31 +0000
From:	"Jan Beulich" <JBeulich@...e.com>
To:	"Jeremy Fitzhardinge" <jeremy@...p.org>,
	"Konrad Rzeszutek Wilk" <konrad.wilk@...cle.com>
Cc:	"xen-devel" <xen-devel@...ts.xen.org>,
	<linux-kernel@...r.kernel.org>
Subject: [PATCH] xenbus: don't free other end details too early

The individual drivers' remove functions could legitimately attempt to
access this information (for logging messages if nothing else). Note
that I did not in fact observe a problem anywhere, but I came across
this while looking into the reasons for what turned out to need the
fix at https://lkml.org/lkml/2012/3/5/336 to vsprintf().

Signed-off-by: Jan Beulich <jbeulich@...e.com>

---
 drivers/xen/xenbus/xenbus_probe.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- 3.3-rc6/drivers/xen/xenbus/xenbus_probe.c
+++ 3.3-rc6-xenbus-remove-details/drivers/xen/xenbus/xenbus_probe.c
@@ -257,11 +257,12 @@ int xenbus_dev_remove(struct device *_de
 	DPRINTK("%s", dev->nodename);
 
 	free_otherend_watch(dev);
-	free_otherend_details(dev);
 
 	if (drv->remove)
 		drv->remove(dev);
 
+	free_otherend_details(dev);
+
 	xenbus_switch_state(dev, XenbusStateClosed);
 	return 0;
 }




View attachment "linux-3.3-rc6-xenbus-remove-details.patch" of type "text/plain" (890 bytes)