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authorTuan Phan <tuanphan@os.amperecomputing.com>2021-06-17 19:08:49 +0300
committerWill Deacon <will@kernel.org>2021-06-17 21:45:02 +0300
commit4e16f283edc289820e9b2d6f617ed8e514ee8396 (patch)
tree830b869e222f99ad9e5a311f3ce7cb5ce7e46ae0 /drivers/perf
parent64432f09068a0fa76f20918a3c22ee3484a3762d (diff)
downloadlinux-4e16f283edc289820e9b2d6f617ed8e514ee8396.tar.xz
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 <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>
Diffstat (limited to 'drivers/perf')
-rw-r--r--drivers/perf/arm-cmn.c2
1 files changed, 1 insertions, 1 deletions
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;
}
}