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tcp: cookie transactions setsockopt memory leak

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There is a bug in do_tcp_setsockopt(net/ipv4/tcp.c),
TCP_COOKIE_TRANSACTIONS case.
In some cases (when tp->cookie_values == NULL) new tcp_cookie_values
structure can be allocated (at cvp), but not bound to
tp->cookie_values. So a memory leak occurs.

Signed-off-by: Dmitry Popov <dp@highloadlab.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dmitry Popov 2010-07-29 01:59:36 +00:00 committed by David S. Miller
parent eeaf61d889
commit a3bdb549e3
1 changed files with 5 additions and 2 deletions
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7
net/ipv4/tcp.c
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@ -2176,6 +2176,8 @@ static int do_tcp_setsockopt(struct sock *sk, int level,
GFP_KERNEL);
if (cvp == NULL)
return -ENOMEM;
kref_init(&cvp->kref);
}
lock_sock(sk);
tp->rx_opt.cookie_in_always =
@ -2190,12 +2192,11 @@ static int do_tcp_setsockopt(struct sock *sk, int level,
*/
kref_put(&tp->cookie_values->kref,
tcp_cookie_values_release);
kref_init(&cvp->kref);
tp->cookie_values = cvp;
} else {
cvp = tp->cookie_values;
}
}
if (cvp != NULL) {
cvp->cookie_desired = ctd.tcpct_cookie_desired;
@ -2209,6 +2210,8 @@ static int do_tcp_setsockopt(struct sock *sk, int level,
cvp->s_data_desired = ctd.tcpct_s_data_desired;
cvp->s_data_constant = 0; /* false */
}
tp->cookie_values = cvp;
}
release_sock(sk);
return err;