net/sctp: fix a null dereference in sctp_disposition sctp_sf_do_5_1D_ce()

[ Upstream commit 2f311968 ]

If new_asoc->peer.adaptation_ind=0 and sctp_ulpevent_make_authkey=0
and sctp_ulpevent_make_authkey() returns 0, then the variable
ai_ev remains zero and the zero will be dereferenced
in the sctp_ulpevent_free() function.

Signed-off-by: Alexandr Sapozhnikov <alsp705@gmail.com>
Acked-by: Xin Long <lucien.xin@gmail.com>
Fixes: 30f6ebf6 ("sctp: add SCTP_AUTH_NO_AUTH type for AUTHENTICATION_EVENT")
Link: https://patch.msgid.link/20251002091448.11-1-alsp705@gmail.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>