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[RESEND,v1,3/9] spmi: pmic-arb: check apid against limits before calling irq handler

Message ID 1630484290-28190-4-git-send-email-quic_fenglinw@quicinc.com (mailing list archive)
State Superseded
Headers show
Series A bunch of fix and optimization patches in spmi-pmic-arb.c | expand

Commit Message

Fenglin Wu Sept. 1, 2021, 8:18 a.m. UTC 
From: David Collins <collinsd@codeaurora.org>

Check that the apid for an SPMI interrupt falls between the
min_apid and max_apid that can be handled by the APPS processor
before invoking the per-apid interrupt handler:
periph_interrupt().

This avoids an access violation in rare cases where the status
bit is set for an interrupt that is not owned by the APPS
processor.

Signed-off-by: David Collins <collinsd@codeaurora.org>
Signed-off-by: Fenglin Wu <quic_fenglinw@quicinc.com>
---
 drivers/spmi/spmi-pmic-arb.c | 6 ++++++
 1 file changed, 6 insertions(+)
diff mbox series

Patch

diff --git a/drivers/spmi/spmi-pmic-arb.c b/drivers/spmi/spmi-pmic-arb.c
index 4d7ad004..c4adc06 100644
--- a/drivers/spmi/spmi-pmic-arb.c
+++ b/drivers/spmi/spmi-pmic-arb.c
@@ -535,6 +535,12 @@  static void pmic_arb_chained_irq(struct irq_desc *desc)
 			id = ffs(status) - 1;
 			status &= ~BIT(id);
 			apid = id + i * 32;
+			if (apid < pmic_arb->min_apid
+			    || apid > pmic_arb->max_apid) {
+				WARN_ONCE(true, "spurious spmi irq received for apid=%d\n",
+					apid);
+				continue;
+			}
 			enable = readl_relaxed(
 					ver_ops->acc_enable(pmic_arb, apid));
 			if (enable & SPMI_PIC_ACC_ENABLE_BIT)