ice: Add check for kzalloc

Add the check for the return value of kzalloc in order to avoid
NULL pointer dereference.
Moreover, use the goto-label to share the clean code.

Fixes: d6b98c8d242a ("ice: add write functionality for GNSS TTY")
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Tested-by: Gurucharan G <gurucharanx.g@intel.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

diff --git a/drivers/net/ethernet/intel/ice/ice_gnss.c b/drivers/net/ethernet/intel/ice/ice_gnss.c
index a191555..43e199b 100644 (file)
--- a/drivers/net/ethernet/intel/ice/ice_gnss.c
+++ b/drivers/net/ethernet/intel/ice/ice_gnss.c
@@ -461,6 +461,9 @@ static struct tty_driver *ice_gnss_create_tty_driver(struct ice_pf *pf)
        for (i = 0; i < ICE_GNSS_TTY_MINOR_DEVICES; i++) {
                pf->gnss_tty_port[i] = kzalloc(sizeof(*pf->gnss_tty_port[i]),
                                               GFP_KERNEL);
+               if (!pf->gnss_tty_port[i])
+                       goto err_out;
+
                pf->gnss_serial[i] = NULL;
 
                tty_port_init(pf->gnss_tty_port[i]);
@@ -470,21 +473,23 @@ static struct tty_driver *ice_gnss_create_tty_driver(struct ice_pf *pf)
        err = tty_register_driver(tty_driver);
        if (err) {
                dev_err(dev, "Failed to register TTY driver err=%d\n", err);
-
-               for (i = 0; i < ICE_GNSS_TTY_MINOR_DEVICES; i++) {
-                       tty_port_destroy(pf->gnss_tty_port[i]);
-                       kfree(pf->gnss_tty_port[i]);
-               }
-               kfree(ttydrv_name);
-               tty_driver_kref_put(pf->ice_gnss_tty_driver);
-
-               return NULL;
+               goto err_out;
        }
 
        for (i = 0; i < ICE_GNSS_TTY_MINOR_DEVICES; i++)
                dev_info(dev, "%s%d registered\n", ttydrv_name, i);
 
        return tty_driver;
+
+err_out:
+       while (i--) {
+               tty_port_destroy(pf->gnss_tty_port[i]);
+               kfree(pf->gnss_tty_port[i]);
+       }
+       kfree(ttydrv_name);
+       tty_driver_kref_put(pf->ice_gnss_tty_driver);
+
+       return NULL;
 }
 
 /**