tree d1dbf57afc7d561620ad1b192ae031fd234b085a
parent 012c437d03cb299814e58ac8d574f7510f5989a5
author Kirill Korotaev <dev@sw.ru> 1155536663 -0700
committer Greg Kroah-Hartman <gregkh@suse.de> 1155585269 -0700

[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>