net: bnxt_ptp: fix compilation error

commit dcf500065fabe27676dfe7b4ba521a4f1e0fc8ac upstream.

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.
Change the TSIO_PIN_VALID() function to also check that a pin ID is not
negative and use this macro in bnxt_ptp_enable() to check the result of
the calls to ptp_find_pin() to return an error early for invalid pins.
This fixes the compilation error.

Cc: <stable@vger.kernel.org>
Fixes: 9e518f25802c ("bnxt_en: 1PPS functions to configure TSIO pins")
Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Reviewed-by: Michael Chan <michael.chan@broadcom.com>
Link: https://lore.kernel.org/r/20220328062708.207079-1-damien.lemoal@opensource.wdc.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c
index f0aa480799ca4be31bba006c6148479e026ad759..62a931de5b1a74d0037ee6eb94a87478bbf0d9b8 100644 (file)
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c
@@ -331,7 +331,7 @@ static int bnxt_ptp_enable(struct ptp_clock_info *ptp_info,
        struct bnxt_ptp_cfg *ptp = container_of(ptp_info, struct bnxt_ptp_cfg,
                                                ptp_info);
        struct bnxt *bp = ptp->bp;
-       u8 pin_id;
+       int pin_id;
        int rc;
 
        switch (rq->type) {
@@ -339,6 +339,8 @@ 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 (!TSIO_PIN_VALID(pin_id))
+                       return -EOPNOTSUPP;
                if (!on)
                        break;
                rc = bnxt_ptp_cfg_pin(bp, pin_id, BNXT_PPS_PIN_PPS_IN);
@@ -352,6 +354,8 @@ 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 (!TSIO_PIN_VALID(pin_id))
+                       return -EOPNOTSUPP;
                if (!on)
                        break;
 

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h b/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h
index fa5f05708e6df5633b798f57bbc5c982a7ec8d3d..c3cd51e672e7b4876d2b17273b1d3c74b6977873 100644 (file)
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h
@@ -28,7 +28,7 @@ struct pps_pin {
        u8 state;
 };
 
-#define TSIO_PIN_VALID(pin) ((pin) < (BNXT_MAX_TSIO_PINS))
+#define TSIO_PIN_VALID(pin) ((pin) >= 0 && (pin) < (BNXT_MAX_TSIO_PINS))
 
 #define EVENT_DATA2_PPS_EVENT_TYPE(data2)                              \
        ((data2) & ASYNC_EVENT_CMPL_PPS_TIMESTAMP_EVENT_DATA2_EVENT_TYPE)