From: Herakliusz Lipiec Date: Mon, 29 Apr 2019 17:31:21 +0000 (+0100) Subject: net/tap: fix potential IPC buffer overrun X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=9ad43ad8fbeeec1a485233227da21fd71e175984;p=dpdk.git net/tap: fix potential IPC buffer overrun When secondary to primary process synchronization occurs there is no check for number of fds which could cause buffer overrun. Bugzilla ID: 252 Fixes: c9aa56edec8e ("net/tap: access primary process queues from secondary") Cc: stable@dpdk.org Signed-off-by: Herakliusz Lipiec Reviewed-by: Anatoly Burakov Reviewed-by: Ferruh Yigit --- diff --git a/drivers/net/tap/rte_eth_tap.c b/drivers/net/tap/rte_eth_tap.c index f8a4169c5f..47a2b68f1d 100644 --- a/drivers/net/tap/rte_eth_tap.c +++ b/drivers/net/tap/rte_eth_tap.c @@ -2111,6 +2111,11 @@ tap_mp_attach_queues(const char *port_name, struct rte_eth_dev *dev) TAP_LOG(DEBUG, "Received IPC reply for %s", reply_param->port_name); /* Attach the queues from received file descriptors */ + if (reply_param->rxq_count + reply_param->txq_count != reply->num_fds) { + TAP_LOG(ERR, "Unexpected number of fds received"); + return -1; + } + dev->data->nb_rx_queues = reply_param->rxq_count; dev->data->nb_tx_queues = reply_param->txq_count; fd_iterator = 0; @@ -2151,19 +2156,24 @@ tap_mp_sync_queues(const struct rte_mp_msg *request, const void *peer) /* Fill file descriptors for all queues */ reply.num_fds = 0; reply_param->rxq_count = 0; + if (dev->data->nb_rx_queues + dev->data->nb_tx_queues > + RTE_MP_MAX_FD_NUM){ + TAP_LOG(ERR, "Number of rx/tx queues exceeds max number of fds"); + return -1; + } + for (queue = 0; queue < dev->data->nb_rx_queues; queue++) { reply.fds[reply.num_fds++] = process_private->rxq_fds[queue]; reply_param->rxq_count++; } RTE_ASSERT(reply_param->rxq_count == dev->data->nb_rx_queues); - RTE_ASSERT(reply_param->txq_count == dev->data->nb_tx_queues); - RTE_ASSERT(reply.num_fds <= RTE_MP_MAX_FD_NUM); reply_param->txq_count = 0; for (queue = 0; queue < dev->data->nb_tx_queues; queue++) { reply.fds[reply.num_fds++] = process_private->txq_fds[queue]; reply_param->txq_count++; } + RTE_ASSERT(reply_param->txq_count == dev->data->nb_tx_queues); /* Send reply */ strlcpy(reply.name, request->name, sizeof(reply.name));