sctp: translate network order to host order when users get a hmacid

commit 7a84bd46647ff181eb2659fdc99590e6f16e501d upstream.

Commit ed5a377d87dc ("sctp: translate host order to network order when
setting a hmacid") corrected the hmacid byte-order when setting a hmacid.
but the same issue also exists on getting a hmacid.

We fix it by changing hmacids to host order when users get them with
getsockopt.

Fixes: Commit ed5a377d87dc ("sctp: translate host order to network order when setting a hmacid")
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index bb8c3b4..5b0e16c 100644 (file)
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -5309,6 +5309,7 @@ static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
        struct sctp_hmac_algo_param *hmacs;
        __u16 data_len = 0;
        u32 num_idents;
        struct sctp_hmac_algo_param *hmacs;
        __u16 data_len = 0;
        u32 num_idents;

+       int i;

 
        if (!sctp_auth_enable)
                return -EACCES;
 
        if (!sctp_auth_enable)
                return -EACCES;


@@ -5326,8 +5327,12 @@ static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
                return -EFAULT;
        if (put_user(num_idents, &p->shmac_num_idents))
                return -EFAULT;
                return -EFAULT;
        if (put_user(num_idents, &p->shmac_num_idents))
                return -EFAULT;

-       if (copy_to_user(p->shmac_idents, hmacs->hmac_ids, data_len))
-               return -EFAULT;
+       for (i = 0; i < num_idents; i++) {
+               __u16 hmacid = ntohs(hmacs->hmac_ids[i]);
+
+               if (copy_to_user(&p->shmac_idents[i], &hmacid, sizeof(__u16)))
+                       return -EFAULT;
+       }

        return 0;
 }
 
        return 0;
 }