Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 3.16 54/55] driver/base/node: remove unnecessary kfree of node struct from unregister_one_node | Date | Mon, 13 Oct 2014 04:25:08 +0200 |
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3.16-stable review patch. If anyone has any objections, please let me know.
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From: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
commit 33ead538f642a33b1d658782a5d14a40b5014d1f upstream.
Commit 92d585ef067d ("numa: fix NULL pointer access and memory leak in unregister_one_node()") added kfree() of node struct in unregister_one_node(). But node struct is freed by node_device_release() which is called in unregister_node(). So by adding the kfree(), node struct is freed two times.
While hot removing memory, the commit leads the following BUG_ON():
kernel BUG at mm/slub.c:3346! invalid opcode: 0000 [#1] SMP [...] Call Trace: [...] unregister_one_node [...] try_offline_node [...] remove_memory [...] acpi_memory_device_remove [...] acpi_bus_trim [...] acpi_bus_trim [...] acpi_device_hotplug [...] acpi_hotplug_work_fn [...] process_one_work [...] worker_thread [...] ? rescuer_thread [...] kthread [...] ? kthread_create_on_node [...] ret_from_fork [...] ? kthread_create_on_node
This patch removes unnecessary kfree() from unregister_one_node().
Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> Cc: Xishi Qiu <qiuxishi@huawei.com> Fixes: 92d585ef067d "numa: fix NULL pointer access and memory leak in unregister_one_node()" Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/base/node.c | 1 - 1 file changed, 1 deletion(-)
--- a/drivers/base/node.c +++ b/drivers/base/node.c @@ -603,7 +603,6 @@ void unregister_one_node(int nid) return; unregister_node(node_devices[nid]); - kfree(node_devices[nid]); node_devices[nid] = NULL; }
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