[SCTP]: Fix protocol violation when receiving an error lenght INIT-ACK

[sfrench/cifs-2.6.git] / net / sctp / sm_statefuns.c

diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
index f2ed6473feef5e60da676c2e36ae412220c0c52b..3ef97499df0ddb1631098b505efb2de2775dca23 100644 (file)
--- a/net/sctp/sm_statefuns.c
+++ b/net/sctp/sm_statefuns.c
@@ -4144,6 +4144,24 @@ static sctp_disposition_t sctp_sf_abort_violation(
                goto nomem;
 
        if (asoc) {
+               /* Treat INIT-ACK as a special case during COOKIE-WAIT. */
+               if (chunk->chunk_hdr->type == SCTP_CID_INIT_ACK &&
+                   !asoc->peer.i.init_tag) {
+                       sctp_initack_chunk_t *initack;
+
+                       initack = (sctp_initack_chunk_t *)chunk->chunk_hdr;
+                       if (!sctp_chunk_length_valid(chunk,
+                                                    sizeof(sctp_initack_chunk_t)))
+                               abort->chunk_hdr->flags |= SCTP_CHUNK_FLAG_T;
+                       else {
+                               unsigned int inittag;
+
+                               inittag = ntohl(initack->init_hdr.init_tag);
+                               sctp_add_cmd_sf(commands, SCTP_CMD_UPDATE_INITTAG,
+                                               SCTP_U32(inittag));
+                       }
+               }
+
                sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(abort));
                SCTP_INC_STATS(SCTP_MIB_OUTCTRLCHUNKS);