[PATCH] perf/arm-cmn: Fix invalid pointer when access dtc object sharing the same IRQ number
From: Tuan Phan <hidden>
Date: 2021-06-17 16:13:32
Also in:
lkml
Subsystem:
arm interconnect pmu drivers, arm pmu profiling and debugging, the rest · Maintainers:
Robin Murphy, Will Deacon, Mark Rutland, Linus Torvalds
When multiple dtcs share the same IRQ number, the irq_friend which
used to refer to dtc object gets calculated incorrect which leads
to invalid pointer.
Fixes: 0ba64770a2f2 ("perf: Add Arm CMN-600 PMU driver")
Signed-off-by: Tuan Phan <redacted>
---
drivers/perf/arm-cmn.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/perf/arm-cmn.c b/drivers/perf/arm-cmn.c
index 56a5c35..49016f2 100644
--- a/drivers/perf/arm-cmn.c
+++ b/drivers/perf/arm-cmn.c@@ -1212,7 +1212,7 @@ static int arm_cmn_init_irqs(struct arm_cmn *cmn) irq = cmn->dtc[i].irq; for (j = i; j--; ) { if (cmn->dtc[j].irq == irq) { - cmn->dtc[j].irq_friend = j - i; + cmn->dtc[j].irq_friend = i - j; goto next; } }
--
2.7.4
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