netdev - [PATCH] sctp: account stream padding length for reconf chunk

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Date:   Mon, 11 Oct 2021 08:42:57 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Vlad Yasevich <vyasevich@...il.com>,
        Neil Horman <nhorman@...driver.com>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, linux-sctp@...r.kernel.org,
        netdev@...r.kernel.org,
        Eiichi Tsukata <eiichi.tsukata@...anix.com>,
        gregkh@...uxfoundation.org
Subject: [PATCH] sctp: account stream padding length for reconf chunk

From: Eiichi Tsukata <eiichi.tsukata@...anix.com>

"stream_len" is not always multiple of 4. Account padding length
which can be added in sctp_addto_chunk() for reconf chunk.

Cc: Vlad Yasevich <vyasevich@...il.com>
Cc: Neil Horman <nhorman@...driver.com>
Cc: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Jakub Kicinski <kuba@...nel.org>
Cc: linux-sctp@...r.kernel.org
Cc: netdev@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Fixes: cc16f00f6529 ("sctp: add support for generating stream reconf ssn reset request chunk")
Reported-by: syzbot <syzkaller@...glegroups.com>
Cc: stable <stable@...r.kernel.org>
Signed-off-by: Eiichi Tsukata <eiichi.tsukata@...anix.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/sctp/sm_make_chunk.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index b8fa8f1a7277..f7a1072a2a2a 100644
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -3694,8 +3694,8 @@ struct sctp_chunk *sctp_make_strreset_req(
 	struct sctp_chunk *retval;
 	__u16 outlen, inlen;
 
-	outlen = (sizeof(outreq) + stream_len) * out;
-	inlen = (sizeof(inreq) + stream_len) * in;
+	outlen = (sizeof(outreq) + SCTP_PAD4(stream_len)) * out;
+	inlen = (sizeof(inreq) + SCTP_PAD4(stream_len)) * in;
 
 	retval = sctp_make_reconf(asoc, outlen + inlen);
 	if (!retval)
-- 
2.33.0