netdev - Re: [PATCH] net/sctp: fix a null dereference in sctp_disposition sctp_sf_do_5_1D

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Message-ID: <CADvbK_frvOEC4-UbuYixCu2RbQuAOQLmTsi5-sGnO8_+ZSpT8A@mail.gmail.com>
Date: Thu, 2 Oct 2025 15:27:25 -0400
From: Xin Long <lucien.xin@...il.com>
To: Alexandr Sapozhnkiov <alsp705@...il.com>
Cc: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>, "David S. Miller" <davem@...emloft.net>, 
	Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
	linux-sctp@...r.kernel.org, netdev@...r.kernel.org, 
	linux-kernel@...r.kernel.org, lvc-project@...uxtesting.org
Subject: Re: [PATCH] net/sctp: fix a null dereference in sctp_disposition sctp_sf_do_5_1D_ce()

On Thu, Oct 2, 2025 at 5:14 AM Alexandr Sapozhnkiov <alsp705@...il.com> wrote:
>
> From: Alexandr Sapozhnikov <alsp705@...il.com>
>
> 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.
>
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
>
> Signed-off-by: Alexandr Sapozhnikov <alsp705@...il.com>

Fixes: 30f6ebf65bc4 ("sctp: add SCTP_AUTH_NO_AUTH type for
AUTHENTICATION_EVENT")

Acked-by: Xin Long <lucien.xin@...il.com>