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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: 0ba64770a2 ("perf: Add Arm CMN-600 PMU driver")

Signed-off-by: Tuan Phan <tuanphan@os.amperecomputing.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/1623946129-3290-1-git-send-email-tuanphan@os.amperecomputing.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Tuan Phan 2021-06-17 09:08:49 -07:00 committed by Will Deacon
parent 64432f0906
commit 4e16f283ed
1 changed files with 1 additions and 1 deletions
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2
drivers/perf/arm-cmn.c
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@ -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;
}
}