Commit ee7538a0 authored Aug 20, 2013 by Will Deacon Committed by Catalin Marinas Aug 20, 2013

arm64: perf: fix event validation for software group leaders



This is a port of c95eb318 ("ARM: 7809/1: perf: fix event validation
for software group leaders") to arm64, which fixes a panic in the arm64
perf backend found as a result of Vince's fuzzing tool.

Cc: <stable@vger.kernel.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

parent 868f6fea

arch/arm64/kernel/perf_event.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -322,6 +322,9 @@ validate_event(struct pmu_hw_events *hw_events,
		struct hw_perf_event fake_event = event->hw;
		struct pmu *leader_pmu = event->group_leader->pmu;

		if (is_software_event(event))
		return 1;

		if (event->pmu != leader_pmu \|\| event->state <= PERF_EVENT_STATE_OFF)
		return 1;