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authorEric Dumazet <edumazet@google.com>2015-04-16 18:10:35 -0700
committerDavid S. Miller <davem@davemloft.net>2015-04-17 13:28:31 -0400
commit521f1cf1dbb9d5ad858dca5dc75d1b45f64b6589 (patch)
tree2c6276958f5d7348616d887f4a64f5b78ec6b9ef /net/ipv4/tcp_vegas.h
parentfad9dfefea6405039491e7e4fc21fb6e59e7d26c (diff)
inet_diag: fix access to tcp cc information
Two different problems are fixed here : 1) inet_sk_diag_fill() might be called without socket lock held. icsk->icsk_ca_ops can change under us and module be unloaded. -> Access to freed memory. Fix this using rcu_read_lock() to prevent module unload. 2) Some TCP Congestion Control modules provide information but again this is not safe against icsk->icsk_ca_ops change and nla_put() errors were ignored. Some sockets could not get the additional info if skb was almost full. Fix this by returning a status from get_info() handlers and using rcu protection as well. Signed-off-by: Eric Dumazet <edumazet@google.com> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_vegas.h')
-rw-r--r--net/ipv4/tcp_vegas.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/tcp_vegas.h b/net/ipv4/tcp_vegas.h
index 0531b99d8637..e8a6b33cc61d 100644
--- a/net/ipv4/tcp_vegas.h
+++ b/net/ipv4/tcp_vegas.h
@@ -19,6 +19,6 @@ void tcp_vegas_init(struct sock *sk);
void tcp_vegas_state(struct sock *sk, u8 ca_state);
void tcp_vegas_pkts_acked(struct sock *sk, u32 cnt, s32 rtt_us);
void tcp_vegas_cwnd_event(struct sock *sk, enum tcp_ca_event event);
-void tcp_vegas_get_info(struct sock *sk, u32 ext, struct sk_buff *skb);
+int tcp_vegas_get_info(struct sock *sk, u32 ext, struct sk_buff *skb);
#endif /* __TCP_VEGAS_H */