From: Kirill Korotaev <dev@sw.ru>
Date: Mon, 14 Aug 2006 06:24:23 +0000 (-0700)
Subject: [PATCH] sys_getppid oopses on debug kernel
X-Git-Tag: v2.6.18-rc5~88
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6997a6faaa129a1c91775f7344c8d371a05178ea;p=pandora-kernel.git

[PATCH] sys_getppid oopses on debug kernel

sys_getppid() optimization can access a freed memory.  On kernels with
DEBUG_SLAB turned ON, this results in Oops.  As Dave Hansen noted, this
optimization is also unsafe for memory hotplug.

So this patch always takes the lock to be safe.

[oleg@tv-sign.ru: simplifications]
Signed-off-by: Kirill Korotaev <dev@openvz.org>
Cc: <stable@kernel.org>
Cc: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

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