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PCI: Prevent out of bounds access in numa_node override

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63692df103 ("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: 63692df103 ("PCI: Allow numa_node override via sysfs")
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
CC: stable@vger.kernel.org	# v3.19+
This commit is contained in:
Sasha Levin 2015-10-07 11:03:28 -05:00 committed by Bjorn Helgaas
parent de24c18c0f
commit 1266963170
1 changed files with 1 additions and 1 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

2
drivers/pci/pci-sysfs.c
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@ -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);