From: Alexandr Sapozhnikov <alsp705@gmail.com> stable inclusion from stable-v6.6.113 commit c21f45cfa4a9526b34d76b397c9ef080668b6e73 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/ID6BVQ CVE: CVE-2025-40187 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- [ Upstream commit 2f3119686ef50319490ccaec81a575973da98815 ] 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: 30f6ebf65bc4 ("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> Signed-off-by: Wang Liang <wangliang74@huawei.com> --- net/sctp/sm_statefuns.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c index 808863e047e0..2d88654e8d8e 100644 --- a/net/sctp/sm_statefuns.c +++ b/net/sctp/sm_statefuns.c @@ -884,7 +884,8 @@ enum sctp_disposition sctp_sf_do_5_1D_ce(struct net *net, return SCTP_DISPOSITION_CONSUME; nomem_authev: - sctp_ulpevent_free(ai_ev); + if (ai_ev) + sctp_ulpevent_free(ai_ev); nomem_aiev: sctp_ulpevent_free(ev); nomem_ev: -- 2.34.1