From 4e16f283edc289820e9b2d6f617ed8e514ee8396 Mon Sep 17 00:00:00 2001 From: Tuan Phan Date: Thu, 17 Jun 2021 09:08:49 -0700 Subject: perf/arm-cmn: Fix invalid pointer when access dtc object sharing the same IRQ number 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 Reviewed-by: Robin Murphy Link: https://lore.kernel.org/r/1623946129-3290-1-git-send-email-tuanphan@os.amperecomputing.com Signed-off-by: Will Deacon --- drivers/perf/arm-cmn.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/perf') diff --git a/drivers/perf/arm-cmn.c b/drivers/perf/arm-cmn.c index 4f46f654279d..bc3cba5f8c5d 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; } } -- cgit v1.2.3