SCTP: Fix chunk acceptance when no authenticated chunks were listed.

In the case where no autheticated chunks were specified, we were still
trying to verify that a given chunk needs authentication and doing so
incorrectly.  Add a check for parameter length to make sure we don't
try to use an empty auth_chunks parameter to verify against.

Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>

diff --git a/net/sctp/auth.c b/net/sctp/auth.c
index 6d5fa6b..6d89e35 100644 (file)
--- a/net/sctp/auth.c
+++ b/net/sctp/auth.c
@@ -631,7 +631,7 @@ static int __sctp_auth_cid(sctp_cid_t chunk, struct sctp_chunks_param *param)
        int found = 0;
        int i;
 
-       if (!param)
+       if (!param || param->param_hdr.length == 0)
                return 0;
 
        len = ntohs(param->param_hdr.length) - sizeof(sctp_paramhdr_t);