sctp: fix random memory dereference with SCTP_HMAC_IDENT option.

[safe/jmp/linux-2.6] / net / sctp / auth.c

diff --git a/net/sctp/auth.c b/net/sctp/auth.c
index 1fcb4cf..52db5f6 100644 (file)
--- a/net/sctp/auth.c
+++ b/net/sctp/auth.c
@@ -786,6 +786,9 @@ int sctp_auth_ep_set_hmacs(struct sctp_endpoint *ep,
        for (i = 0; i < hmacs->shmac_num_idents; i++) {
                id = hmacs->shmac_idents[i];
 
+               if (id > SCTP_AUTH_HMAC_ID_MAX)
+                       return -EOPNOTSUPP;
+
                if (SCTP_AUTH_HMAC_ID_SHA1 == id)
                        has_sha1 = 1;