From: wang, biao <biao.wang@intel.com>
Date: Thu, 16 May 2013 01:50:13 +0000 (+0800)
Subject: klist: del waiter from klist_remove_waiters before wakeup waitting process
X-Git-Tag: v3.10-rc3~24^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ac5a2962b02f57dea76d314ef2521a2170b28ab6;p=pandora-kernel.git

klist: del waiter from klist_remove_waiters before wakeup waitting process

There is a race between klist_remove and klist_release. klist_remove
uses a local var waiter saved on stack. When klist_release calls
wake_up_process(waiter->process) to wake up the waiter, waiter might run
immediately and reuse the stack. Then, klist_release calls
list_del(&waiter->list) to change previous
wait data and cause prior waiter thread corrupt.

The patch fixes it against kernel 3.9.

Signed-off-by: wang, biao <biao.wang@intel.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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