linux-kernel - [PATCH 4.3 18/71] sctp: translate host order to network order when setting a hmacid

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Date:	Sat, 12 Dec 2015 12:05:42 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Xin Long <lucien.xin@...il.com>,
	Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
	Neil Horman <nhorman@...driver.com>,
	Vlad Yasevich <vyasevich@...il.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.3 18/71] sctp: translate host order to network order when setting a hmacid

4.3-stable review patch.  If anyone has any objections, please let me know.

------------------

From: lucien <lucien.xin@...il.com>

[ Upstream commit ed5a377d87dc4c87fb3e1f7f698cba38cd893103 ]

now sctp auth cannot work well when setting a hmacid manually, which
is caused by that we didn't use the network order for hmacid, so fix
it by adding the transformation in sctp_auth_ep_set_hmacs.

even we set hmacid with the network order in userspace, it still
can't work, because of this condition in sctp_auth_ep_set_hmacs():

		if (id > SCTP_AUTH_HMAC_ID_MAX)
			return -EOPNOTSUPP;

so this wasn't working before and thus it won't break compatibility.

Fixes: 65b07e5d0d09 ("[SCTP]: API updates to suport SCTP-AUTH extensions.")
Signed-off-by: Xin Long <lucien.xin@...il.com>
Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
Acked-by: Neil Horman <nhorman@...driver.com>
Acked-by: Vlad Yasevich <vyasevich@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/sctp/auth.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/net/sctp/auth.c
+++ b/net/sctp/auth.c
@@ -809,8 +809,8 @@ int sctp_auth_ep_set_hmacs(struct sctp_e
 	if (!has_sha1)
 		return -EINVAL;
 
-	memcpy(ep->auth_hmacs_list->hmac_ids, &hmacs->shmac_idents[0],
-		hmacs->shmac_num_idents * sizeof(__u16));
+	for (i = 0; i < hmacs->shmac_num_idents; i++)
+		ep->auth_hmacs_list->hmac_ids[i] = htons(hmacs->shmac_idents[i]);
 	ep->auth_hmacs_list->param_hdr.length = htons(sizeof(sctp_paramhdr_t) +
 				hmacs->shmac_num_idents * sizeof(__u16));
 	return 0;


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