Thread (2 messages) 2 messages, 2 authors, 2025-09-22

Re: [PATCH] sctp: fix null deref in sctp_sf_do_5_1D_ce()

From: Xin Long <lucien.xin@gmail.com>
Date: 2025-09-22 17:22:42
Also in: linux-sctp, lkml

On Mon, Sep 22, 2025 at 12:17 PM Alexey Simakov
[off-list ref] wrote:
quoted hunk ↗ jump to hunk
The check of new_asoc->peer.adaptation_ind can fail,
leaving ai_ev uninitialized. 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 a 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 <redacted>
---
 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);
The patch can not be applied. It seems these 3 lines start with spaces?
You may run ./scripts/checkpatch.pl against it.

Thanks.
 nomem_aiev:
        sctp_ulpevent_free(ev);
 nomem_ev:
--
2.34.1

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