linux-kernel - [PATCH] usb: typec: tipd: Prevent uninitialized event{1,2} in IRQ handler

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Message-Id: <20221102161542.30669-1-sven@svenpeter.dev>
Date:   Wed,  2 Nov 2022 17:15:42 +0100
From:   Sven Peter <sven@...npeter.dev>
To:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Sven Peter <sven@...npeter.dev>, Hector Martin <marcan@...can.st>,
        Guido Günther <agx@...xcpu.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        asahi@...ts.linux.dev
Subject: [PATCH] usb: typec: tipd: Prevent uninitialized event{1,2} in IRQ handler

If reading TPS_REG_INT_EVENT1/2 fails in the interrupt handler event1
and event2 may be uninitialized when they are used to determine
IRQ_HANDLED vs. IRQ_NONE in the error path.

Fixes: c7260e29dd20 ("usb: typec: tipd: Add short-circuit for no irqs")
Fixes: 45188f27b3d0 ("usb: typec: tipd: Add support for Apple CD321X")
Signed-off-by: Sven Peter <sven@...npeter.dev>
---
 drivers/usb/typec/tipd/core.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/typec/tipd/core.c b/drivers/usb/typec/tipd/core.c
index b637e8b378b3..2a77bab948f5 100644
--- a/drivers/usb/typec/tipd/core.c
+++ b/drivers/usb/typec/tipd/core.c
@@ -474,7 +474,7 @@ static void tps6598x_handle_plug_event(struct tps6598x *tps, u32 status)
 static irqreturn_t cd321x_interrupt(int irq, void *data)
 {
 	struct tps6598x *tps = data;
-	u64 event;
+	u64 event = 0;
 	u32 status;
 	int ret;
 
@@ -519,8 +519,8 @@ static irqreturn_t cd321x_interrupt(int irq, void *data)
 static irqreturn_t tps6598x_interrupt(int irq, void *data)
 {
 	struct tps6598x *tps = data;
-	u64 event1;
-	u64 event2;
+	u64 event1 = 0;
+	u64 event2 = 0;
 	u32 status;
 	int ret;
 
-- 
2.25.1