[PATCH] PCI: prevent out of bounds access in numa_node override

[Sasha Levin]

Commit 63692df1 ("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: 63692df1 ("PCI: Allow numa_node override via sysfs")
Signed-off-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
---
 drivers/pci/pci-sysfs.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index 312f23a..e9abca8 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -216,7 +216,7 @@ static ssize_t numa_node_store(struct device *dev,
 	if (ret)
 		return ret;
 
-	if (!node_online(node))
+	if (node > MAX_NUMNODES || !node_online(node))
 		return -EINVAL;
 
 	add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
-- 
1.7.10.4

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