linux-kernel - [PATCH] sctp: fix null derefer in sctp_sf_do_5_1D

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20251009173248.11881-1-bigalex934@gmail.com>
Date: Thu,  9 Oct 2025 20:32:49 +0300
From: Alexey Simakov <bigalex934@...il.com>
To: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
Cc: Alexey Simakov <bigalex934@...il.com>,
	Xin Long <lucien.xin@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Simon Horman <horms@...nel.org>,
	linux-sctp@...r.kernel.org,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	lvc-project@...uxtesting.org
Subject: [PATCH] sctp: fix null derefer in sctp_sf_do_5_1D_ce()

The check of new_asoc->peer.adaptation_ind can fail,
leaving ai_ev unitilialized. In that case, the code
can jump to the nomem_authdev label and later call
sctp_ulpevent_free() with a null  ai_ev pointer.
Leading to potential null dereference.

Add check of ai_ev pointer before call of
sctp_ulpevent_free function.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: 30f6ebf65bc4 ("sctp: add SCTP_AUTH_NO_AUTH type for AUTHENTICATION_EVENT")
Signed-off-by: Alexey Simakov <bigalex934@...il.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 a0524ba8d787..93cac73472c7 100644
--- a/net/sctp/sm_statefuns.c
+++ b/net/sctp/sm_statefuns.c
@@ -885,7 +885,8 @@ 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

I already have sent this patch from another email, but
he wasnt applicable since company mail server corrupt
it.