linux-kernel - [RESEND PATCH v6 04/10] spmi: pmic-arb: check apid against limits before calling irq handler

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Date:   Sun, 12 Jun 2022 11:24:40 +0800
From:   Fenglin Wu <quic_fenglinw@...cinc.com>
To:     <linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <sboyd@...nel.org>
CC:     <quic_collinsd@...cinc.com>, <quic_subbaram@...cinc.com>,
        <quic_fenglinw@...cinc.com>, <tglx@...utronix.de>,
        <maz@...nel.org>, "David Collins" <collinsd@...eaurora.org>
Subject: [RESEND PATCH v6 04/10] spmi: pmic-arb: check apid against limits before calling irq handler

From: David Collins <collinsd@...eaurora.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@...eaurora.org>
Signed-off-by: Fenglin Wu <quic_fenglinw@...cinc.com>
---
 drivers/spmi/spmi-pmic-arb.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/spmi/spmi-pmic-arb.c b/drivers/spmi/spmi-pmic-arb.c
index 2bc3b88..e19eaec 100644
--- a/drivers/spmi/spmi-pmic-arb.c
+++ b/drivers/spmi/spmi-pmic-arb.c
@@ -625,21 +625,26 @@ static void pmic_arb_chained_irq(struct irq_desc *desc)
 	struct spmi_pmic_arb *pmic_arb = irq_desc_get_handler_data(desc);
 	const struct pmic_arb_ver_ops *ver_ops = pmic_arb->ver_ops;
 	struct irq_chip *chip = irq_desc_get_chip(desc);
-	int first = pmic_arb->min_apid >> 5;
-	int last = pmic_arb->max_apid >> 5;
+	int first = pmic_arb->min_apid;
+	int last = pmic_arb->max_apid;
 	u8 ee = pmic_arb->ee;
 	u32 status, enable, handled = 0;
 	int i, id, apid;
 
 	chained_irq_enter(chip, desc);
 
-	for (i = first; i <= last; ++i) {
+	for (i = first >> 5; i <= last >> 5; ++i) {
 		status = readl_relaxed(
 				ver_ops->owner_acc_status(pmic_arb, ee, i));
 		while (status) {
 			id = ffs(status) - 1;
 			status &= ~BIT(id);
 			apid = id + i * 32;
+			if (apid < first || apid > last) {
+				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)
-- 
2.7.4