perf: Validate cpu early in perf_event_alloc()
authorOleg Nesterov <oleg@redhat.com>
Tue, 18 Jan 2011 16:10:32 +0000 (17:10 +0100)
committerIngo Molnar <mingo@elte.hu>
Tue, 18 Jan 2011 18:34:23 +0000 (19:34 +0100)
commit66832eb4baaaa9abe4c993ddf9113a79e39b9915
treebc1b60069c5313231a5ddca0f0dcab953489bb1e
parent22a4ec729017ba613337a28f306f94ba5023fe2e
perf: Validate cpu early in perf_event_alloc()

Starting from perf_event_alloc()->perf_init_event(), the kernel
assumes that event->cpu is either -1 or the valid CPU number.

Change perf_event_alloc() to validate this argument early. This
also means we can remove the similar check in
find_get_context().

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Prasad <prasad@linux.vnet.ibm.com>
Cc: Roland McGrath <roland@redhat.com>
Cc: gregkh@suse.de
Cc: stable@kernel.org
LKML-Reference: <20110118161032.GC693@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
kernel/perf_event.c