[PATCH 4.1 58/86] PCI: Prevent out of bounds access in numa_node override

From: Greg Kroah-Hartman
Date: Fri Nov 06 2015 - 15:06:58 EST

4.1-stable review patch. If anyone has any objections, please let me know.


From: Sasha Levin <sasha.levin@xxxxxxxxxx>

commit 1266963170f576d4d08e6310b6963e26d3ff9d1e upstream.

63692df103e9 ("PCI: Allow numa_node override via sysfs") didn't check that
the numa node provided by userspace is valid. Passing a node number too
high would attempt to access invalid memory and trigger a kernel panic.

Fixes: 63692df103e9 ("PCI: Allow numa_node override via sysfs")
Signed-off-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

drivers/pci/pci-sysfs.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -216,7 +216,7 @@ static ssize_t numa_node_store(struct de
if (ret)
return ret;

- if (!node_online(node))
+ if (node >= MAX_NUMNODES || !node_online(node))
return -EINVAL;


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