netdev - Re: [PATCH v2] net: bnxt_ptp: fix compilation error

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Date:   Sun, 27 Mar 2022 22:36:26 -0700
From:   Michael Chan <michael.chan@...adcom.com>
To:     Damien Le Moal <damien.lemoal@...nsource.wdc.com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Netdev <netdev@...r.kernel.org>,
        Pavan Chebbi <pavan.chebbi@...adcom.com>
Subject: Re: [PATCH v2] net: bnxt_ptp: fix compilation error

On Sun, Mar 27, 2022 at 8:35 PM Damien Le Moal
<damien.lemoal@...nsource.wdc.com> wrote:
>
> The Broadcom bnxt_ptp driver does not compile with GCC 11.2.2 when
> CONFIG_WERROR is enabled. The following error is generated:
>
> drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c: In function ‘bnxt_ptp_enable’:
> drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c:400:43: error: array
> subscript 255 is above array bounds of ‘struct pps_pin[4]’
> [-Werror=array-bounds]
>   400 |  ptp->pps_info.pins[pin_id].event = BNXT_PPS_EVENT_EXTERNAL;
>       |  ~~~~~~~~~~~~~~~~~~^~~~~~~~
> In file included from drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c:20:
> drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h:75:24: note: while
> referencing ‘pins’
>    75 |         struct pps_pin pins[BNXT_MAX_TSIO_PINS];
>       |                        ^~~~
> cc1: all warnings being treated as errors
>
> This is due to the function ptp_find_pin() returning a pin ID of -1 when
> a valid pin is not found and this error never being checked.
> Use the TSIO_PIN_VALID() macroin bnxt_ptp_enable() to check the result
> of the calls to ptp_find_pin() in bnxt_ptp_enable() to fix this
> compilation error.
>
> Fixes: 9e518f25802c ("bnxt_en: 1PPS functions to configure TSIO pins")
> Cc: <stable@...r.kernel.org>
> Signed-off-by: Damien Le Moal <damien.lemoal@...nsource.wdc.com>
> ---
> Changes from v1:
> * No need to change the TSIO_PIN_VALID() macro as pin_id is an unsigned
>   value.
>
>  drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c
> index a0b321a19361..3c8fccbb9013 100644
> --- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c
> +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c
> @@ -390,7 +390,7 @@ static int bnxt_ptp_enable(struct ptp_clock_info *ptp_info,
>                 /* Configure an External PPS IN */
>                 pin_id = ptp_find_pin(ptp->ptp_clock, PTP_PF_EXTTS,
>                                       rq->extts.index);
> -               if (!on)
> +               if (!on || !TSIO_PIN_VALID(pin_id))

I think we need to return an error if !TSIO_PIN_VALID().  If we just
break, we'll still use pin_id after the switch statement.

>                         break;
>                 rc = bnxt_ptp_cfg_pin(bp, pin_id, BNXT_PPS_PIN_PPS_IN);
>                 if (rc)
> @@ -403,7 +403,7 @@ static int bnxt_ptp_enable(struct ptp_clock_info *ptp_info,
>                 /* Configure a Periodic PPS OUT */
>                 pin_id = ptp_find_pin(ptp->ptp_clock, PTP_PF_PEROUT,
>                                       rq->perout.index);
> -               if (!on)
> +               if (!on || !TSIO_PIN_VALID(pin_id))

Same here.

>                         break;
>
>                 rc = bnxt_ptp_cfg_pin(bp, pin_id, BNXT_PPS_PIN_PPS_OUT);
> --
> 2.35.1
>

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