From: Pan Bian <bianpan2016@163.com>
Date: Sun, 23 Apr 2017 11:53:58 +0000 (+0800)
Subject: staging: wilc1000: fix unchecked return value
X-Git-Tag: v4.14-rc1~980^2~53
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=9e96652756ad647b7bcc03cb99ffc9756d7b5f93;p=platform%2Fkernel%2Flinux-rpi.git

staging: wilc1000: fix unchecked return value

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>
---

diff --git a/drivers/staging/wilc1000/linux_mon.c b/drivers/staging/wilc1000/linux_mon.c
index f328d75..c9782d4 100644
--- a/drivers/staging/wilc1000/linux_mon.c
+++ b/drivers/staging/wilc1000/linux_mon.c
@@ -197,6 +197,8 @@ static netdev_tx_t WILC_WFI_mon_xmit(struct sk_buff *skb,
 
 	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);