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authorEric Dumazet <edumazet@google.com>2019-09-05 13:20:41 -0700
committerDavid S. Miller <davem@davemloft.net>2019-09-07 17:32:28 +0200
commitb58662a5f7f4677debd5e28d10145cf5decd516b (patch)
tree32d0dcfaa1ed927c724a286773a3e47317f9f780
parent3dd97a08271f031bd54c61e65b6b0ebfb0c404b7 (diff)
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: 61723b393292 ("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>
-rw-r--r--net/ipv4/tcp_diag.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/tcp_diag.c b/net/ipv4/tcp_diag.c
index babc156deabb..81a8221d650a 100644
--- a/net/ipv4/tcp_diag.c
+++ b/net/ipv4/tcp_diag.c
@@ -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;