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Date: Thu, 6 Mar 2014 17:18:21 +0800 From: Xishi Qiu <qiuxishi@...wei.com> To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, <jiang.liu@...ux.intel.com> CC: LKML <linux-kernel@...r.kernel.org>, Xishi Qiu <qiuxishi@...wei.com> Subject: [PATCH] numa: fix NULL pointer access and memory leak in unregister_one_node() When doing socket hot remove, "node_devices[nid]" is set to NULL; acpi_processor_remove() try_offline_node() unregister_one_node() Then hot add a socket, but do not echo 1 > /sys/devices/system/cpu/cpuXX/online, so register_one_node() will not be called, and "node_devices[nid]" is still NULL. If doing socket hot remove again, NULL pointer access will be happen. unregister_one_node() unregister_node() Another, we should free the memory used by "node_devices[nid]" in unregister_one_node(). Signed-off-by: Xishi Qiu <qiuxishi@...wei.com> --- drivers/base/node.c | 4 ++++ 1 files changed, 4 insertions(+), 0 deletions(-) diff --git a/drivers/base/node.c b/drivers/base/node.c index bc9f43b..8f7ed99 100644 --- a/drivers/base/node.c +++ b/drivers/base/node.c @@ -599,7 +599,11 @@ int register_one_node(int nid) void unregister_one_node(int nid) { + if (!node_devices[nid]) + return; + unregister_node(node_devices[nid]); + kfree(node_devices[nid]); node_devices[nid] = NULL; } -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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