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Diffstat (limited to 'net/ipv4/tcp_input.c')
-rw-r--r--net/ipv4/tcp_input.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 2c0ff327b6df..39c393cc0fd3 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -5886,9 +5886,15 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb)
if (th->syn) {
if (th->fin)
goto discard;
- if (icsk->icsk_af_ops->conn_request(sk, skb) < 0)
- return 1;
+ /* It is possible that we process SYN packets from backlog,
+ * so we need to make sure to disable BH right there.
+ */
+ local_bh_disable();
+ acceptable = icsk->icsk_af_ops->conn_request(sk, skb) >= 0;
+ local_bh_enable();
+ if (!acceptable)
+ return 1;
consume_skb(skb);
return 0;
}