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inet_diag: fix access to tcp cc information

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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>
This commit is contained in:
Eric Dumazet 2015-04-16 18:10:35 -07:00 • committed by David S. Miller
parent fad9dfefea
commit 521f1cf1db
7 changed files with 36 additions and 18 deletions
Download patch file Download diff file Expand all files Collapse all files

5
net/ipv4/tcp_vegas.c
View file

@ -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);