From: wangweidong <wangweidong1@huawei.com>
Date: Wed, 13 Jan 2016 03:06:41 +0000 (+0800)
Subject: bgmac: fix a missing check for build_skb
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=1124701061d8cb3f0c2906a8d23288114e046ebf;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

bgmac: fix a missing check for build_skb

commit f1640c3ddeec12804bc9a21feee85fc15aca95f6 upstream.

when build_skb failed, it may occure a NULL pointer.
So add a 'NULL check' for it.

Signed-off-by: Weidong Wang <wangweidong1@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/net/ethernet/broadcom/bgmac.c b/drivers/net/ethernet/broadcom/bgmac.c
index b56c9c581359..b7e10e1b9131 100644
--- a/drivers/net/ethernet/broadcom/bgmac.c
+++ b/drivers/net/ethernet/broadcom/bgmac.c
@@ -469,6 +469,11 @@ static int bgmac_dma_rx_read(struct bgmac *bgmac, struct bgmac_dma_ring *ring,
 			len -= ETH_FCS_LEN;
 
 			skb = build_skb(buf, BGMAC_RX_ALLOC_SIZE);
+			if (unlikely(skb)) {
+				bgmac_err(bgmac, "build_skb failed\n");
+				put_page(virt_to_head_page(buf));
+				break;
+			}
 			skb_put(skb, BGMAC_RX_FRAME_OFFSET +
 				BGMAC_RX_BUF_OFFSET + len);
 			skb_pull(skb, BGMAC_RX_FRAME_OFFSET +