in sctp_process_asconf(), we get address parameter from the beginning of the addip params. but we never check if it's really there. if the addr param is not there, it still can pass sctp_verify_asconf(), then to be handled by sctp_process_asconf(), it will not be safe.
so add a code in sctp_verify_asconf() to check the address parameter is in the beginning, or return false to send abort. note that this can also detect multiple address parameters, and reject it. Signed-off-by: Xin Long <lucien....@gmail.com> Signed-off-by: Marcelo Ricardo Leitner <mleit...@redhat.com> --- net/sctp/sm_make_chunk.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c index 06320c8..a655ddc 100644 --- a/net/sctp/sm_make_chunk.c +++ b/net/sctp/sm_make_chunk.c @@ -3132,11 +3132,18 @@ bool sctp_verify_asconf(const struct sctp_association *asoc, case SCTP_PARAM_IPV4_ADDRESS: if (length != sizeof(sctp_ipv4addr_param_t)) return false; + /* ensure there is only one addr param and it's in the + * beginning of addip_hdr params, or we reject it. + */ + if (param.v != addip->addip_hdr.params) + return false; addr_param_seen = true; break; case SCTP_PARAM_IPV6_ADDRESS: if (length != sizeof(sctp_ipv6addr_param_t)) return false; + if (param.v != addip->addip_hdr.params) + return false; addr_param_seen = true; break; case SCTP_PARAM_ADD_IP: -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html