From: Santosh Shilimkar Date: Fri, 28 Jun 2019 22:38:58 +0000 (-0700) Subject: rds: avoid version downgrade to legitimate newer peer connections X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=dc205a8d34228809dedab94a85a866cbb255248f;p=openwrt%2Fstaging%2Fblogic.git rds: avoid version downgrade to legitimate newer peer connections Connections with legitimate tos values can get into usual connection race. It can result in consumer reject. We don't want tos value or protocol version to be demoted for such connections otherwise piers would end up different tos values which can results in no connection. Example a peer initiated connection with say tos 8 while usual connection racing can get downgraded to tos 0 which is not desirable. Patch fixes above issue introduced by commit commit d021fabf525f ("rds: rdma: add consumer reject") Reported-by: Yanjun Zhu Tested-by: Yanjun Zhu Signed-off-by: Santosh Shilimkar --- diff --git a/net/rds/rdma_transport.c b/net/rds/rdma_transport.c index 9db455d02255..ff74c4bbb9fc 100644 --- a/net/rds/rdma_transport.c +++ b/net/rds/rdma_transport.c @@ -117,8 +117,10 @@ static int rds_rdma_cm_event_handler_cmn(struct rdma_cm_id *cm_id, ((*err) <= RDS_RDMA_REJ_INCOMPAT))) { pr_warn("RDS/RDMA: conn <%pI6c, %pI6c> rejected, dropping connection\n", &conn->c_laddr, &conn->c_faddr); - conn->c_proposed_version = RDS_PROTOCOL_COMPAT_VERSION; - conn->c_tos = 0; + + if (!conn->c_tos) + conn->c_proposed_version = RDS_PROTOCOL_COMPAT_VERSION; + rds_conn_drop(conn); } rdsdebug("Connection rejected: %s\n",