[PATCH 1/2 net] sctp: handle invalid error codes without calling BUG()

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The sctp_sf_eat_auth() function is supposed to return enum sctp_disposition
values but if the call to sctp_ulpevent_make_authkey() fails, it returns

This results in calling BUG() inside the sctp_side_effects() function.
Calling BUG() is an over reaction and not helpful.  Call WARN_ON_ONCE()

This code predates git.

Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
This is just from reviewing the code and not tested.

To be honest, the WARN_ON_ONCE() stack trace is not very helpful either
because it wouldn't include sctp_sf_eat_auth().  It's the best I can
think of though.

 net/sctp/sm_sideeffect.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/sctp/sm_sideeffect.c b/net/sctp/sm_sideeffect.c
index 7fbeb99d8d32..8c88045f26c6 100644
--- a/net/sctp/sm_sideeffect.c
+++ b/net/sctp/sm_sideeffect.c
@@ -1250,7 +1250,10 @@ static int sctp_side_effects(enum sctp_event_type event_type,
 		pr_err("impossible disposition %d in state %d, event_type %d, event_id %d\n",
 		       status, state, event_type, subtype.chunk);
-		BUG();
+		error = status;
+		if (error >= 0)
+			error = -EINVAL;

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