[PATCH v2 2/2] net/ice: check illegal packets

[Kevin Liu]

If the length of data_len in mbuf is less than 17 or
greater than the maximum frame size, it is illegal.

These illegal packets will lead to TX/RX hang and
can't recover automatically.

This patch check those illegal packets and protect
TX/RX from hanging.

Fixes: 17c7d0f9d6a4 ("net/ice: support basic Rx/Tx")
Signed-off-by: Kevin Liu <kevinx.liu at intel.com>
---
 drivers/net/ice/ice_rxtx.c | 11 +++++++++++
 drivers/net/ice/ice_rxtx.h |  2 ++
 2 files changed, 13 insertions(+)

diff --git a/drivers/net/ice/ice_rxtx.c b/drivers/net/ice/ice_rxtx.c
index 5af7c0c8f6..d1e1fadf9d 100644
--- a/drivers/net/ice/ice_rxtx.c
+++ b/drivers/net/ice/ice_rxtx.c
@@ -3442,6 +3442,9 @@ ice_prep_pkts(__rte_unused void *tx_queue, struct rte_mbuf **tx_pkts,
 	int i, ret;
 	uint64_t ol_flags;
 	struct rte_mbuf *m;
+	struct ice_tx_queue *txq = tx_queue;
+	struct rte_eth_dev *dev = &rte_eth_devices[txq->port_id];
+	uint16_t max_frame_size = dev->data->mtu + ICE_ETH_OVERHEAD;
 
 	for (i = 0; i < nb_pkts; i++) {
 		m = tx_pkts[i];
@@ -3458,6 +3461,14 @@ ice_prep_pkts(__rte_unused void *tx_queue, struct rte_mbuf **tx_pkts,
 			return i;
 		}
 
+		/* check the data_len in mbuf */
+		if (m->data_len < ICE_TX_MIN_PKT_LEN ||
+			m->data_len > max_frame_size) {
+			rte_errno = EINVAL;
+			PMD_DRV_LOG(ERR, "INVALID mbuf: bad data_len=[%hu]", m->data_len);
+			return i;
+		}
+
 #ifdef RTE_ETHDEV_DEBUG_TX
 		ret = rte_validate_tx_offload(m);
 		if (ret != 0) {
diff --git a/drivers/net/ice/ice_rxtx.h b/drivers/net/ice/ice_rxtx.h
index 6c08c175dc..e1d4fe8e47 100644
--- a/drivers/net/ice/ice_rxtx.h
+++ b/drivers/net/ice/ice_rxtx.h
@@ -40,6 +40,8 @@
 
 #define ICE_RXDID_COMMS_OVS	22
 
+#define ICE_TX_MIN_PKT_LEN 17
+
 extern uint64_t ice_timestamp_dynflag;
 extern int ice_timestamp_dynfield_offset;
 
-- 
2.25.1