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perf pmu: Add check for valid cpuid in perf_pmu__find_map()

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On some platforms(arm/arm64) which uses cpus map to get corresponding
cpuid string, cpuid can be NULL for PMUs other than CORE PMUs.  Adding
check for NULL cpuid in function perf_pmu__find_map to avoid
segmentation fault.

Signed-off-by: Ganapatrao Kulkarni <ganapatrao.kulkarni@cavium.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Ganapatrao Kulkarni <gklkml16@gmail.com>
Cc: Jayachandran C <jnair@caviumnetworks.com>
Cc: Jonathan Cameron <jonathan.cameron@huawei.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Robert Richter <robert.richter@cavium.com>
Cc: Shaokun Zhang <zhangshaokun@hisilicon.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/20171016183222.25750-6-ganapatrao.kulkarni@cavium.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Ganapatrao Kulkarni 2017-10-17 00:02:22 +05:30 committed by Arnaldo Carvalho de Melo
parent d3964221ea
commit de3d0f12be
1 changed files with 6 additions and 0 deletions
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6
tools/perf/util/pmu.c
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@ -601,6 +601,12 @@ struct pmu_events_map *perf_pmu__find_map(struct perf_pmu *pmu)
char *cpuid = perf_pmu__getcpuid(pmu);
int i;
/* on some platforms which uses cpus map, cpuid can be NULL for
* PMUs other than CORE PMUs.
*/
if (!cpuid)
return NULL;
i = 0;
for (;;) {
map = &pmu_events_map[i++];