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PCI: Prevent out of bounds access in numa_node override 

Commit 1266963170 ("PCI: Prevent out of bounds access in numa_node
override") missed that the user-provided node could also be negative.
Handle this case as well to avoid out-of-bounds accesses to the
node_states[] array.  However, allow the special value -1, i.e.
NUMA_NO_NODE, to be able to set the 'no specific node' configuration.

Fixes: 1266963170 ("PCI: Prevent out of bounds access in numa_node override")
Fixes: 63692df103 ("PCI: Allow numa_node override via sysfs")
Signed-off-by: Mathias Krause <minipli@googlemail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
CC: Sasha Levin <sasha.levin@oracle.com>
CC: Prarit Bhargava <prarit@redhat.com>
CC: stable@vger.kernel.org	# v3.19+
This commit is contained in:
Mathias Krause 2015-11-09 20:00:27 +01:00 committed by Bjorn Helgaas
parent 1ec218373b
commit 3dcc8d39cf
1 changed files with 4 additions and 1 deletions
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5
drivers/pci/pci-sysfs.c
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@ -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 < 0 && 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);