linux-kernel - [PATCH v2] net: mwifiex: fix a NULL pointer dereference

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Message-Id: <20190323035711.23882-1-kjlu@umn.edu>
Date:   Fri, 22 Mar 2019 22:57:11 -0500
From:   Kangjie Lu <kjlu@....edu>
To:     kjlu@....edu
Cc:     pakki001@....edu, Amitkumar Karwar <amitkarwar@...il.com>,
        Nishant Sarmukadam <nishants@...vell.com>,
        Ganapathi Bhat <gbhat@...vell.com>,
        Xinming Hu <huxinming820@...il.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2] net: mwifiex: fix a NULL pointer dereference

In case dev_alloc_skb fails, the fix returns -ENOMEM to avoid
NULL pointer dereference.

Signed-off-by: Kangjie Lu <kjlu@....edu>
---
V2: minor change: simply remove whitespace
---
 drivers/net/wireless/marvell/mwifiex/cmdevt.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/wireless/marvell/mwifiex/cmdevt.c b/drivers/net/wireless/marvell/mwifiex/cmdevt.c
index 60db2b969e20..8c35441fd9b7 100644
--- a/drivers/net/wireless/marvell/mwifiex/cmdevt.c
+++ b/drivers/net/wireless/marvell/mwifiex/cmdevt.c
@@ -341,6 +341,12 @@ static int mwifiex_dnld_sleep_confirm_cmd(struct mwifiex_adapter *adapter)
 		sleep_cfm_tmp =
 			dev_alloc_skb(sizeof(struct mwifiex_opt_sleep_confirm)
 				      + MWIFIEX_TYPE_LEN);
+		if (!sleep_cfm_tmp) {
+			mwifiex_dbg(adapter, ERROR,
+				    "SLEEP_CFM: dev_alloc_skb failed\n");
+			return -ENOMEM;
+		}
+
 		skb_put(sleep_cfm_tmp, sizeof(struct mwifiex_opt_sleep_confirm)
 			+ MWIFIEX_TYPE_LEN);
 		put_unaligned_le32(MWIFIEX_USB_TYPE_CMD, sleep_cfm_tmp->data);
-- 
2.17.1