linux-kernel - [PATCH] mwifiex: Fix potential NULL pointer dereference

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Date:   Wed, 13 Mar 2019 13:42:29 -0500
From:   Aditya Pakki <pakki001@....edu>
To:     pakki001@....edu
Cc:     kjlu@....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] mwifiex: Fix potential NULL pointer dereference

dev_alloc_skb can fail and return a NULL pointer. The patch avoids
a potential NULL pointer dereference and returns -ENOMEM.

Signed-off-by: Aditya Pakki <pakki001@....edu>
---
 drivers/net/wireless/marvell/mwifiex/cmdevt.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/wireless/marvell/mwifiex/cmdevt.c b/drivers/net/wireless/marvell/mwifiex/cmdevt.c
index 60db2b969e20..4e2fa972a78a 100644
--- a/drivers/net/wireless/marvell/mwifiex/cmdevt.c
+++ b/drivers/net/wireless/marvell/mwifiex/cmdevt.c
@@ -341,6 +341,9 @@ 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)
+			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