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ARM: 7356/1: perf: check that we have an event in the PMU IRQ handlers

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The PMU IRQ handlers in perf assume that if a counter has overflowed
then perf must be responsible. In the paranoid world of crazy hardware,
this could be false, so check that we do have a valid event before
attempting to dereference NULL in the interrupt path.

Cc: <stable@vger.kernel.org>
Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Will Deacon
2012-03-06 17:34:50 +01:00
committed by Russell King
parent 99c1745b9c
commit f6f5a30c83
3 changed files with 12 additions and 18 deletions
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6
arch/arm/kernel/perf_event_xscale.c
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@@ -255,6 +255,9 @@ xscale1pmu_handle_irq(int irq_num, void *dev)
struct perf_event *event = cpuc->events[idx];
struct hw_perf_event *hwc;
if (!event)
continue;
if (!xscale1_pmnc_counter_has_overflowed(pmnc, idx))
continue;
@@ -592,6 +595,9 @@ xscale2pmu_handle_irq(int irq_num, void *dev)
struct perf_event *event = cpuc->events[idx];
struct hw_perf_event *hwc;
if (!event)
continue;
if (!xscale2_pmnc_counter_has_overflowed(pmnc, idx))
continue;