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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
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5
net/ipv4/tcp_dctcp.c
View file

@ -277,7 +277,7 @@ static void dctcp_cwnd_event(struct sock *sk, enum tcp_ca_event ev)
}
}
static void dctcp_get_info(struct sock *sk, u32 ext, struct sk_buff *skb)
static int dctcp_get_info(struct sock *sk, u32 ext, struct sk_buff *skb)
{
const struct dctcp *ca = inet_csk_ca(sk);
@ -297,8 +297,9 @@ static void dctcp_get_info(struct sock *sk, u32 ext, struct sk_buff *skb)
info.dctcp_ab_tot = ca->acked_bytes_total;
}
nla_put(skb, INET_DIAG_DCTCPINFO, sizeof(info), &info);
return nla_put(skb, INET_DIAG_DCTCPINFO, sizeof(info), &info);
}
return 0;
}
static struct tcp_congestion_ops dctcp __read_mostly = {