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Date: Tue, 17 Jul 2012 22:42:13 +0200
From: Eric Dumazet <eric.dumazet@...il.com>
To: David Miller <davem@...emloft.net>
Cc: netdev <netdev@...r.kernel.org>
Subject: [PATCH net-next] ipv4: fix rcu splat
From: Eric Dumazet <edumazet@...gle.com>
free_nh_exceptions() should use rcu_dereference_protected(..., 1)
since its called after one RCU grace period.
Also add some const-ification in recent code.
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
net/ipv4/fib_semantics.c | 4 ++--
net/ipv4/inet_connection_sock.c | 4 ++--
net/ipv4/route.c | 13 +++++++------
3 files changed, 11 insertions(+), 10 deletions(-)
diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
index 1e09852..2b57d76 100644
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -148,11 +148,11 @@ static void free_nh_exceptions(struct fib_nh *nh)
for (i = 0; i < FNHE_HASH_SIZE; i++) {
struct fib_nh_exception *fnhe;
- fnhe = rcu_dereference(hash[i].chain);
+ fnhe = rcu_dereference_protected(hash[i].chain, 1);
while (fnhe) {
struct fib_nh_exception *next;
- next = rcu_dereference(fnhe->fnhe_next);
+ next = rcu_dereference_protected(fnhe->fnhe_next, 1);
kfree(fnhe);
fnhe = next;
diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c
index 89e74a3..68bb5a6 100644
--- a/net/ipv4/inet_connection_sock.c
+++ b/net/ipv4/inet_connection_sock.c
@@ -806,8 +806,8 @@ EXPORT_SYMBOL_GPL(inet_csk_compat_setsockopt);
static struct dst_entry *inet_csk_rebuild_route(struct sock *sk, struct flowi *fl)
{
- struct inet_sock *inet = inet_sk(sk);
- struct ip_options_rcu *inet_opt;
+ const struct inet_sock *inet = inet_sk(sk);
+ const struct ip_options_rcu *inet_opt;
__be32 daddr = inet->inet_daddr;
struct flowi4 *fl4;
struct rtable *rt;
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 812e444..f67e702 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1275,7 +1275,7 @@ static void rt_del(unsigned int hash, struct rtable *rt)
spin_unlock_bh(rt_hash_lock_addr(hash));
}
-static void __build_flow_key(struct flowi4 *fl4, struct sock *sk,
+static void __build_flow_key(struct flowi4 *fl4, const struct sock *sk,
const struct iphdr *iph,
int oif, u8 tos,
u8 prot, u32 mark, int flow_flags)
@@ -1294,7 +1294,8 @@ static void __build_flow_key(struct flowi4 *fl4, struct sock *sk,
iph->daddr, iph->saddr, 0, 0);
}
-static void build_skb_flow_key(struct flowi4 *fl4, struct sk_buff *skb, struct sock *sk)
+static void build_skb_flow_key(struct flowi4 *fl4, const struct sk_buff *skb,
+ const struct sock *sk)
{
const struct iphdr *iph = ip_hdr(skb);
int oif = skb->dev->ifindex;
@@ -1305,10 +1306,10 @@ static void build_skb_flow_key(struct flowi4 *fl4, struct sk_buff *skb, struct s
__build_flow_key(fl4, sk, iph, oif, tos, prot, mark, 0);
}
-static void build_sk_flow_key(struct flowi4 *fl4, struct sock *sk)
+static void build_sk_flow_key(struct flowi4 *fl4, const struct sock *sk)
{
const struct inet_sock *inet = inet_sk(sk);
- struct ip_options_rcu *inet_opt;
+ const struct ip_options_rcu *inet_opt;
__be32 daddr = inet->inet_daddr;
rcu_read_lock();
@@ -1323,8 +1324,8 @@ static void build_sk_flow_key(struct flowi4 *fl4, struct sock *sk)
rcu_read_unlock();
}
-static void ip_rt_build_flow_key(struct flowi4 *fl4, struct sock *sk,
- struct sk_buff *skb)
+static void ip_rt_build_flow_key(struct flowi4 *fl4, const struct sock *sk,
+ const struct sk_buff *skb)
{
if (skb)
build_skb_flow_key(fl4, skb, sk);
--
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