diff mbox series

[v3] net/tap: fix potential buffer overrun

Message ID 20190429173121.1025-1-herakliusz.lipiec@intel.com (mailing list archive)
State Accepted, archived
Delegated to: Ferruh Yigit
Headers
Series [v3] net/tap: fix potential buffer overrun |

Checks

Context Check Description
ci/checkpatch success coding style OK
ci/Intel-compilation success Compilation OK
ci/mellanox-Performance-Testing success Performance Testing PASS
ci/intel-Performance-Testing success Performance Testing PASS

Commit Message

Herakliusz Lipiec April 29, 2019, 5:31 p.m. UTC 
When secondary to primary process synchronization occours
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: rasland@mellanox.com
Cc: stable@dpdk.org

Signed-off-by: Herakliusz Lipiec <herakliusz.lipiec@intel.com>
---
 drivers/net/tap/rte_eth_tap.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

Comments

Ferruh Yigit May 2, 2019, 4:31 p.m. UTC | #1 
On 4/29/2019 6:31 PM, Herakliusz Lipiec wrote:
> When secondary to primary process synchronization occours
> 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: rasland@mellanox.com
> Cc: stable@dpdk.org
> 
> Signed-off-by: Herakliusz Lipiec <herakliusz.lipiec@intel.com>

Carrying from prev version:
Reviewed-by: Anatoly Burakov <anatoly.burakov@intel.com>

Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>

Applied to dpdk-next-net/master, thanks.
diff mbox series

Patch

diff --git a/drivers/net/tap/rte_eth_tap.c b/drivers/net/tap/rte_eth_tap.c
index e9fda8cf6..780368bac 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));