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

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Date:   Wed, 2 Nov 2022 17:05:24 +0000
From:   Eric Curtin <ecurtin@...hat.com>
To:     Sven Peter <sven@...npeter.dev>
Cc:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        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: Re: [PATCH] usb: typec: tipd: Prevent uninitialized event{1,2} in IRQ handler

On Wed, 2 Nov 2022 at 16:24, Sven Peter <sven@...npeter.dev> wrote:
>
> 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>

Reviewed-by: Eric Curtin <ecurtin@...hat.com>

> ---
>  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
>
>