netdev - [PATCH net v3] ice: Add check for kzalloc

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Date:   Thu,  8 Dec 2022 20:58:47 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     jiri@...nulli.us
Cc:     leon@...nel.org, jesse.brandeburg@...el.com,
        anthony.l.nguyen@...el.com, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: [PATCH net v3] ice: Add check for kzalloc

As kzalloc may return NULL pointer, the return value should
be checked and return error if fails in order to avoid the
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@...as.ac.cn>
---
Changelog:

v2 -> v3:

1. Use "while (i--)" to simplify the code.

v1 -> v2:

1. Use goto-label to share the clean code.
---
 drivers/net/ethernet/intel/ice/ice_gnss.c | 23 ++++++++++++++---------
 1 file changed, 14 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_gnss.c b/drivers/net/ethernet/intel/ice/ice_gnss.c
index b5a7f246d230..90c620c26516 100644
--- a/drivers/net/ethernet/intel/ice/ice_gnss.c
+++ b/drivers/net/ethernet/intel/ice/ice_gnss.c
@@ -462,6 +462,9 @@ static struct tty_driver *ice_gnss_create_tty_driver(struct ice_pf *pf)
 					       GFP_KERNEL);
 		pf->gnss_serial[i] = NULL;
 
+		if (!pf->gnss_tty_port[i])
+			goto err_out;
+
 		tty_port_init(pf->gnss_tty_port[i]);
 		tty_port_link_device(pf->gnss_tty_port[i], tty_driver, i);
 	}
@@ -469,21 +472,23 @@ 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;
 }
 
 /**
-- 
2.25.1