[PATCH net] tipc: check skb_linearize() return value in tipc_disc_rcv()

[YueHaibing]

If skb_linearize() fails in tipc_disc_rcv(), we need to free the skb instead of
handle it.

Fixes: 25b0b9c4e835 ("tipc: handle collisions of 32-bit node address hash values")
Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx>
---
 net/tipc/discover.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/tipc/discover.c b/net/tipc/discover.c
index e8630707901e..e8dcdf267c0c 100644
--- a/net/tipc/discover.c
+++ b/net/tipc/discover.c
@@ -211,7 +211,10 @@ void tipc_disc_rcv(struct net *net, struct sk_buff *skb,
 	u32 self;
 	int err;
 
-	skb_linearize(skb);
+	if (skb_linearize(skb)) {
+		kfree_skb(skb);
+		return;
+	}
 	hdr = buf_msg(skb);
 
 	if (caps & TIPC_NODE_ID128)
-- 
2.17.1