Patch "netfilter: xt_sctp: validate the flag_info count" has been added to the 4.19-stable tree

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This is a note to let you know that I've just added the patch titled

    netfilter: xt_sctp: validate the flag_info count

to the 4.19-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     netfilter-xt_sctp-validate-the-flag_info-count.patch
and it can be found in the queue-4.19 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From e99476497687ef9e850748fe6d232264f30bc8f9 Mon Sep 17 00:00:00 2001
From: Wander Lairson Costa <wander@xxxxxxxxxx>
Date: Mon, 28 Aug 2023 19:12:55 -0300
Subject: netfilter: xt_sctp: validate the flag_info count

From: Wander Lairson Costa <wander@xxxxxxxxxx>

commit e99476497687ef9e850748fe6d232264f30bc8f9 upstream.

sctp_mt_check doesn't validate the flag_count field. An attacker can
take advantage of that to trigger a OOB read and leak memory
information.

Add the field validation in the checkentry function.

Fixes: 2e4e6a17af35 ("[NETFILTER] x_tables: Abstraction layer for {ip,ip6,arp}_tables")
Cc: stable@xxxxxxxxxxxxxxx
Reported-by: Lucas Leong <wmliang@infosec.exchange>
Signed-off-by: Wander Lairson Costa <wander@xxxxxxxxxx>
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 net/netfilter/xt_sctp.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/net/netfilter/xt_sctp.c
+++ b/net/netfilter/xt_sctp.c
@@ -149,6 +149,8 @@ static int sctp_mt_check(const struct xt
 {
 	const struct xt_sctp_info *info = par->matchinfo;
 
+	if (info->flag_count > ARRAY_SIZE(info->flag_info))
+		return -EINVAL;
 	if (info->flags & ~XT_SCTP_VALID_FLAGS)
 		return -EINVAL;
 	if (info->invflags & ~XT_SCTP_VALID_FLAGS)


Patches currently in stable-queue which might be from wander@xxxxxxxxxx are

queue-4.19/netfilter-xt_sctp-validate-the-flag_info-count.patch
queue-4.19/netfilter-xt_u32-validate-user-space-input.patch



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