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tcp: ulp: fix possible crash in tcp_diag_get_aux_size() 

tcp_diag_get_aux_size() can be called with sockets in any state.

icsk_ulp_ops is only present for full sockets.

For SYN_RECV or TIME_WAIT ones we would access garbage.

Fixes: 61723b3932 ("tcp: ulp: add functions to dump ulp-specific information")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Luke Hsiao <lukehsiao@google.com>
Reported-by: Neal Cardwell <ncardwell@google.com>
Cc: Davide Caratti <dcaratti@redhat.com>
Acked-by: Davide Caratti <dcaratti@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2019-09-05 13:20:41 -07:00 committed by David S. Miller
parent 3dd97a0827
commit b58662a5f7
1 changed files with 1 additions and 1 deletions
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2
net/ipv4/tcp_diag.c
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@ -163,7 +163,7 @@ static size_t tcp_diag_get_aux_size(struct sock *sk, bool net_admin)
}
#endif
if (net_admin) {
if (net_admin && sk_fullsock(sk)) {
const struct tcp_ulp_ops *ulp_ops;
ulp_ops = icsk->icsk_ulp_ops;