The patch below does not apply to the 4.19-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
Possible dependencies:
a1221703a0f7 ("sctp: sctp_sock_filter(): avoid list_entry() on possibly empty list")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From a1221703a0f75a9d81748c516457e0fc76951496 Mon Sep 17 00:00:00 2001
From: Pietro Borrello <borrello@xxxxxxxxxxxxxxxx>
Date: Thu, 9 Feb 2023 12:13:05 +0000
Subject: [PATCH] sctp: sctp_sock_filter(): avoid list_entry() on possibly
empty list
Use list_is_first() to check whether tsp->asoc matches the first
element of ep->asocs, as the list is not guaranteed to have an entry.
Fixes: 8f840e47f190 ("sctp: add the sctp_diag.c file")
Signed-off-by: Pietro Borrello <borrello@xxxxxxxxxxxxxxxx>
Acked-by: Xin Long <lucien.xin@xxxxxxxxx>
Link: https://lore.kernel.org/r/20230208-sctp-filter-v2-1-6e1f4017f326@xxxxxxxxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
diff --git a/net/sctp/diag.c b/net/sctp/diag.c
index a557009e9832..c3d6b92dd386 100644
--- a/net/sctp/diag.c
+++ b/net/sctp/diag.c
@@ -343,11 +343,9 @@ static int sctp_sock_filter(struct sctp_endpoint *ep, struct sctp_transport *tsp
struct sctp_comm_param *commp = p;
struct sock *sk = ep->base.sk;
const struct inet_diag_req_v2 *r = commp->r;
- struct sctp_association *assoc =
- list_entry(ep->asocs.next, struct sctp_association, asocs);
/* find the ep only once through the transports by this condition */
- if (tsp->asoc != assoc)
+ if (!list_is_first(&tsp->asoc->asocs, &ep->asocs))
return 0;
if (r->sdiag_family != AF_UNSPEC && sk->sk_family != r->sdiag_family)
