[PATCH net-next v2] bgmac: fix a missing check for build_skb

From: Weidong Wang
Date: Wed Jan 13 2016 - 06:53:26 EST


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

Signed-off-by: Weidong Wang <wangweidong1@xxxxxxxxxx>
---
change log:
v2:
fix the error logic change which pointed by Paolo Abni
and Felix.

---
drivers/net/ethernet/broadcom/bgmac.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/drivers/net/ethernet/broadcom/bgmac.c b/drivers/net/ethernet/broadcom/bgmac.c
index c7798d3..3974152 100644
--- a/drivers/net/ethernet/broadcom/bgmac.c
+++ b/drivers/net/ethernet/broadcom/bgmac.c
@@ -466,6 +466,11 @@ 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 +
--
1.9.0