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perf: arm_spe: Prevent overflow in PERF_IDX2OFF() 

Cast nr_pages to unsigned long to avoid overflow when handling large
AUX buffer sizes (>= 2 GiB).

Fixes: d5d9696b03 ("drivers/perf: Add support for ARMv8.2 Statistical Profiling Extension")
Signed-off-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Leo Yan 2025-09-17 18:41:39 +01:00 committed by Will Deacon
parent 105f56877f
commit a29fea30dd
1 changed files with 2 additions and 1 deletions
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3
drivers/perf/arm_spe_pmu.c
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@ -99,7 +99,8 @@ struct arm_spe_pmu {
#define to_spe_pmu(p) (container_of(p, struct arm_spe_pmu, pmu))
/* Convert a free-running index from perf into an SPE buffer offset */
#define PERF_IDX2OFF(idx, buf) ((idx) % ((buf)->nr_pages << PAGE_SHIFT))
#define PERF_IDX2OFF(idx, buf) \
((idx) % ((unsigned long)(buf)->nr_pages << PAGE_SHIFT))
/* Keep track of our dynamic hotplug state */
static enum cpuhp_state arm_spe_pmu_online;