[PATCH] PCI: Fix NUMA bounds check

[Prarit Bhargava <prarit@redhat.com>]

Suggested here: http://marc.info/?l=linux-pci&m=144706760307247&w=2

P.

-----8<-----
The fix for 1266963 ("PCI: Prevent out of bounds access in numa_node
override") should allow for the setting of all valid NUMA states including
NUMA_NO_NODE, which is also interpreted as "any node".  This change splits
the test into a range check, and then a separate check to see if the node
is online.

Fixes: 1266963 ("PCI: Prevent out of bounds access in numa_node override")
Cc: Sasha Levin <sasha.levin@oracle.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: stable@vger.kernel.org
Signed-off-by: Prarit Bhargava <prarit@redhat.com>
---
 drivers/pci/pci-sysfs.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index 9261868..6e98182 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -216,7 +216,10 @@ static ssize_t numa_node_store(struct device *dev,
 	if (ret)
 		return ret;
 
-	if (node >= MAX_NUMNODES || !node_online(node))
+	if (node < NUMA_NO_NODE || node >= MAX_NUMNODES)
+		return -EINVAL;
+
+	if (node != NUMA_NO_NODE && !node_online(node))
 		return -EINVAL;
 
 	add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
-- 
1.7.9.3