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perf/x86/intel: Fix constraint access 

Sasha reported that we can get here with .idx==-1, and
cpuc->event_constraints unallocated.

Suggested-by: Stephane Eranian <eranian@google.com>
Reported-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: <stable@vger.kernel.org>
Fixes: b371b59431 ("perf/x86: Fix event/group validation")
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra 2015-09-10 11:58:27 +02:00 committed by Ingo Molnar
parent d249872939
commit ebfb4988f0
1 changed files with 4 additions and 1 deletions
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5
arch/x86/kernel/cpu/perf_event_intel.c
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@ -2316,9 +2316,12 @@ static struct event_constraint *
intel_get_event_constraints(struct cpu_hw_events *cpuc, int idx,
struct perf_event *event)
{
struct event_constraint *c1 = cpuc->event_constraint[idx];
struct event_constraint *c1 = NULL;
struct event_constraint *c2;
if (idx >= 0) /* fake does < 0 */
c1 = cpuc->event_constraint[idx];
/*
* first time only
* - static constraint: no change across incremental scheduling calls