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authorEric Dumazet <edumazet@google.com>2015-04-17 04:10:35 +0300
committerDavid S. Miller <davem@davemloft.net>2015-04-17 20:28:31 +0300
commit521f1cf1dbb9d5ad858dca5dc75d1b45f64b6589 (patch)
tree2c6276958f5d7348616d887f4a64f5b78ec6b9ef /net/ipv4/tcp_vegas.c
parentfad9dfefea6405039491e7e4fc21fb6e59e7d26c (diff)
downloadlinux-521f1cf1dbb9d5ad858dca5dc75d1b45f64b6589.tar.xz
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.c')
-rw-r--r--net/ipv4/tcp_vegas.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/net/ipv4/tcp_vegas.c b/net/ipv4/tcp_vegas.c
index a6afde666ab1..c71a1b8f7bde 100644
--- a/net/ipv4/tcp_vegas.c
+++ b/net/ipv4/tcp_vegas.c
@@ -286,7 +286,7 @@ static void tcp_vegas_cong_avoid(struct sock *sk, u32 ack, u32 acked)
}
/* Extract info for Tcp socket info provided via netlink. */
-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)
{
const struct vegas *ca = inet_csk_ca(sk);
if (ext & (1 << (INET_DIAG_VEGASINFO - 1))) {
@@ -297,8 +297,9 @@ void tcp_vegas_get_info(struct sock *sk, u32 ext, struct sk_buff *skb)
.tcpv_minrtt = ca->minRTT,
};
- nla_put(skb, INET_DIAG_VEGASINFO, sizeof(info), &info);
+ return nla_put(skb, INET_DIAG_VEGASINFO, sizeof(info), &info);
}
+ return 0;
}
EXPORT_SYMBOL_GPL(tcp_vegas_get_info);