From: Eric Dumazet <dada1@cosmosbay.com>
Date: Wed, 9 Jan 2008 07:41:28 +0000 (-0800)
Subject: [SOCK]: Adds a rcu_dereference() in sk_filter
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=9d3e44425e3498eb33f25d94392b4fd0d56a5176;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

[SOCK]: Adds a rcu_dereference() in sk_filter

It seems commit fda9ef5d679b07c9d9097aaf6ef7f069d794a8f9 introduced a RCU
protection for sk_filter(), without a rcu_dereference()

Either we need a rcu_dereference(), either a comment should explain why we
dont need it. I vote for the former.

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/include/net/sock.h b/include/net/sock.h
index 67e35c7e230c..6e1542da33a1 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -944,7 +944,7 @@ static inline int sk_filter(struct sock *sk, struct sk_buff *skb)
 		return err;
 	
 	rcu_read_lock_bh();
-	filter = sk->sk_filter;
+	filter = rcu_dereference(sk->sk_filter);
 	if (filter) {
 		unsigned int pkt_len = sk_run_filter(skb, filter->insns,
 				filter->len);