sctp: check the unrecognized ASCONF parameter before access it

This patch fix to check the unrecognized ASCONF parameter before
access it.

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>

diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index b7acc9c..3d867ce 100644 (file)
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -2861,6 +2861,11 @@ static __be16 sctp_process_asconf_param(struct sctp_association *asoc,
        addr_param = (union sctp_addr_param *)
                        ((void *)asconf_param + sizeof(sctp_addip_param_t));
 
+       if (asconf_param->param_hdr.type != SCTP_PARAM_ADD_IP &&
+           asconf_param->param_hdr.type != SCTP_PARAM_DEL_IP &&
+           asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY)
+               return SCTP_ERROR_UNKNOWN_PARAM;
+
        switch (addr_param->v4.param_hdr.type) {
        case SCTP_PARAM_IPV6_ADDRESS:
                if (!asoc->peer.ipv6_address)
@@ -2958,9 +2963,6 @@ static __be16 sctp_process_asconf_param(struct sctp_association *asoc,
 
                sctp_assoc_set_primary(asoc, peer);
                break;
-       default:
-               return SCTP_ERROR_UNKNOWN_PARAM;
-               break;
        }
 
        return SCTP_ERROR_NO_ERROR;