linux-kernel - [PATCH 3.17 24/25] driver/base/node: remove unnecessary kfree of node struct from unregister_one

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Message-Id: <20141013022455.319783474@linuxfoundation.org>
Date:	Mon, 13 Oct 2014 04:25:17 +0200
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	Xishi Qiu <qiuxishi@...wei.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH 3.17 24/25] driver/base/node: remove unnecessary kfree of node struct from unregister_one_node

3.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Yasuaki Ishimatsu <isimatu.yasuaki@...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@...fujitsu.com>
Cc: Xishi Qiu <qiuxishi@...wei.com>
Fixes: 92d585ef067d "numa: fix NULL pointer access and memory leak in unregister_one_node()"
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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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