net/sfc/base: fix PreFAST static analysis warning (C6001)

Fix warning
"C6001: Using uninitialized memory '*sensor_maskp'"
which could occur when the npages argument to efx_mcdi_sensor_info()
is less than or equal to zero.

Fixes: dfb3b1ce15f6 ("net/sfc/base: import monitors access via MCDI")
Cc: stable@dpdk.org
Signed-off-by: Andrew Lee <alee@solarflare.com>
Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com>

diff --git a/drivers/net/sfc/base/mcdi_mon.c b/drivers/net/sfc/base/mcdi_mon.c
index 8ea4216..7e4264a 100644 (file)
--- a/drivers/net/sfc/base/mcdi_mon.c
+++ b/drivers/net/sfc/base/mcdi_mon.c
@@ -396,6 +396,11 @@ efx_mcdi_sensor_info(
 
        EFSYS_ASSERT(sensor_maskp != NULL);
 
+       if (npages < 1) {
+               rc = EINVAL;
+               goto fail1;
+       }
+
        for (page = 0; page < npages; page++) {
                uint32_t mask;
 
@@ -412,7 +417,7 @@ efx_mcdi_sensor_info(
 
                if (req.emr_rc != 0) {
                        rc = req.emr_rc;
-                       goto fail1;
+                       goto fail2;
                }
 
                mask = MCDI_OUT_DWORD(req, SENSOR_INFO_OUT_MASK);
@@ -420,18 +425,20 @@ efx_mcdi_sensor_info(
                if ((page != (npages - 1)) &&
                    ((mask & (1U << MC_CMD_SENSOR_PAGE0_NEXT)) == 0)) {
                        rc = EINVAL;
-                       goto fail2;
+                       goto fail3;
                }
                sensor_maskp[page] = mask;
        }
 
        if (sensor_maskp[npages - 1] & (1U << MC_CMD_SENSOR_PAGE0_NEXT)) {
                rc = EINVAL;
-               goto fail3;
+               goto fail4;
        }
 
        return (0);
 
+fail4:
+       EFSYS_PROBE(fail4);
 fail3:
        EFSYS_PROBE(fail3);
 fail2: