From 4ff49d83acf048f949e2082f577e2fa36b0cfa37 Mon Sep 17 00:00:00 2001
From: Tejun Heo <tj@kernel.org>
Date: Wed, 22 Dec 2010 10:06:36 +0100
Subject: [PATCH] PCI: pci-stub: ignore zero-length id parameters

commit 99a0fadf561e1f553c08f0a29f8b2578f55dd5f0 upstream.

pci-stub uses strsep() to separate list of ids and generates a warning
message when it fails to parse an id.  However, not specifying the
parameter results in ids set to an empty string.  strsep() happily
returns the empty string as the first token and thus triggers the
warning message spuriously.

Make the tokner ignore zero length ids.

Reported-by: Chris Wright <chrisw@sous-sol.org>
Reported-by: Prasad Joshi <P.G.Joshi@student.reading.ac.uk>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
 drivers/pci/pci-stub.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/pci/pci-stub.c b/drivers/pci/pci-stub.c
index f7b68ca6cc9..4ae494bb1d5 100644
--- a/drivers/pci/pci-stub.c
+++ b/drivers/pci/pci-stub.c
@@ -54,6 +54,9 @@ static int __init pci_stub_init(void)
 			subdevice = PCI_ANY_ID, class=0, class_mask=0;
 		int fields;
 
+		if (!strlen(id))
+			continue;
+
 		fields = sscanf(id, "%x:%x:%x:%x:%x:%x",
 				&vendor, &device, &subvendor, &subdevice,
 				&class, &class_mask);
-- 
2.11.4.GIT