[PATCH] xenbus: check return value of xenbus_scanf()

From	"Jan Beulich" <JBeulich@suse.com>
Newsgroups	linux.kernel
Subject	[PATCH] xenbus: check return value of xenbus_scanf()
Date	2016-07-07 09:50 +0200
Message-ID	<rScem-3Vx-7@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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Set backend state to unknown when unsuccessful.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
---
 drivers/xen/xenbus/xenbus_probe_frontend.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- 4.7-rc6-xenbus_scanf.orig/drivers/xen/xenbus/xenbus_probe_frontend.c
+++ 4.7-rc6-xenbus_scanf/drivers/xen/xenbus/xenbus_probe_frontend.c
@@ -342,7 +342,9 @@ static int backend_state;
 static void xenbus_reset_backend_state_changed(struct xenbus_watch *w,
 					const char **v, unsigned int l)
 {
-	xenbus_scanf(XBT_NIL, v[XS_WATCH_PATH], "", "%i", &backend_state);
+	if (xenbus_scanf(XBT_NIL, v[XS_WATCH_PATH], "", "%i",
+			 &backend_state) != 1)
+		backend_state = XenbusStateUnknown;
 	printk(KERN_DEBUG "XENBUS: backend %s %s\n",
 			v[XS_WATCH_PATH], xenbus_strstate(backend_state));
 	wake_up(&backend_state_wq);

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[PATCH] xenbus: check return value of xenbus_scanf() "Jan Beulich" <JBeulich@suse.com> - 2016-07-07 09:50 +0200

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