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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Pan Bian <bianpan2016@163.com>,
        Sasha Levin <alexander.levin@microsoft.com>
Subject: [PATCH 4.4 54/97] staging: wilc1000: fix unchecked return value
Date:   Fri, 23 Mar 2018 10:54:41 +0100
Message-Id: <20180323094200.696341654@linuxfoundation.org>
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4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Pan Bian <bianpan2016@163.com>


[ Upstream commit 9e96652756ad647b7bcc03cb99ffc9756d7b5f93 ]

Function dev_alloc_skb() will return a NULL pointer if there is no
enough memory. However, in function WILC_WFI_mon_xmit(), its return
value is used without validation. This may result in a bad memory access
bug. This patch fixes the bug.

Signed-off-by: Pan Bian <bianpan2016@163.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/staging/wilc1000/linux_mon.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/staging/wilc1000/linux_mon.c
+++ b/drivers/staging/wilc1000/linux_mon.c
@@ -251,6 +251,8 @@ static netdev_tx_t WILC_WFI_mon_xmit(str
 
 	if (skb->data[0] == 0xc0 && (!(memcmp(broadcast, &skb->data[4], 6)))) {
 		skb2 = dev_alloc_skb(skb->len + sizeof(struct wilc_wfi_radiotap_cb_hdr));
+		if (!skb2)
+			return -ENOMEM;
 
 		memcpy(skb_put(skb2, skb->len), skb->data, skb->len);