From: Marcelo Ricardo Leitner marcelo.leitner@gmail.com
commit ef6c8d6ccf0c1dccdda092ebe8782777cd7803c9 upstream.
When SCTP handles an INIT chunk, it calls for example: sctp_sf_do_5_1B_init sctp_verify_init sctp_verify_param sctp_process_init sctp_process_param handling of SCTP_PARAM_SET_PRIMARY
sctp_verify_init() wasn't doing proper size validation and neither the later handling, allowing it to work over the chunk itself, possibly being uninitialized memory.
Signed-off-by: Marcelo Ricardo Leitner marcelo.leitner@gmail.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/sctp/sm_make_chunk.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-)
--- a/net/sctp/sm_make_chunk.c +++ b/net/sctp/sm_make_chunk.c @@ -2172,9 +2172,16 @@ static enum sctp_ierror sctp_verify_para break;
case SCTP_PARAM_SET_PRIMARY: - if (net->sctp.addip_enable) - break; - goto fallthrough; + if (!net->sctp.addip_enable) + goto fallthrough; + + if (ntohs(param.p->length) < sizeof(struct sctp_addip_param) + + sizeof(struct sctp_paramhdr)) { + sctp_process_inv_paramlength(asoc, param.p, + chunk, err_chunk); + retval = SCTP_IERROR_ABORT; + } + break;
case SCTP_PARAM_HOST_NAME_ADDRESS: /* Tell the peer, we won't support this param. */