Check kmalloc return value before use the buffer.

Signed-off-by: Zhitong Wang <zhitong.wangzt@alibaba-inc.com>

---
 .../staging/rtl8192u/ieee80211/ieee80211_softmac.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c b/drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c
index 27d9257..8718ac9 100644
--- a/drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c
+++ b/drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c
@@ -1579,6 +1579,8 @@ static inline u16 auth_parse(struct sk_buff *skb, u8** challenge, int *chlen)
 		if(*(t++) == MFIE_TYPE_CHALLENGE){
 			*chlen = *(t++);
 			*challenge = (u8*)kmalloc(*chlen, GFP_ATOMIC);
+			if (!*challenge)
+				return -ENOMEM;
 			memcpy(*challenge, t, *chlen);
 		}
 	}
-- 
1.6.5.3

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