[PATCH v2 05/10] net/bnxt: fix a null pointer dereference

[Ajit Khaparde]

From: Kalesh AP <kalesh-anakkur.pura...@broadcom.com>

In the recent changes to rte_eth_dev_release_port() the library sets
eth_dev->data to NULL at the end of the routine. This causes a NULL
pointer dereference in the bnxt_rep_dev_info_get_op() and
bnxt_representor_uninit() routines when it tries to validate parent dev.

Add code to handle this.

Fixes: 6dc83230b43b ("net/bnxt: support port representor data path")
Cc: sta...@dpdk.org

Signed-off-by: Kalesh AP <kalesh-anakkur.pura...@broadcom.com>
Reviewed-by: Ajit Khaparde <ajit.khapa...@broadcom.com>
Reviewed-by: Somnath Kotur <somnath.ko...@broadcom.com>
---
 drivers/net/bnxt/bnxt_reps.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/drivers/net/bnxt/bnxt_reps.c b/drivers/net/bnxt/bnxt_reps.c
index 3a4720bc3c..edcc27f556 100644
--- a/drivers/net/bnxt/bnxt_reps.c
+++ b/drivers/net/bnxt/bnxt_reps.c
@@ -32,6 +32,14 @@ static const struct eth_dev_ops bnxt_rep_dev_ops = {
        .flow_ops_get = bnxt_flow_ops_get_op
 };
 
+static bool bnxt_rep_check_parent(struct bnxt_representor *rep)
+{
+       if (!rep->parent_dev->data->dev_private)
+               return false;
+
+       return true;
+}
+
 uint16_t
 bnxt_vfr_recv(uint16_t port_id, uint16_t queue_id, struct rte_mbuf *mbuf)
 {
@@ -266,12 +274,12 @@ int bnxt_representor_uninit(struct rte_eth_dev *eth_dev)
        PMD_DRV_LOG(DEBUG, "BNXT Port:%d VFR uninit\n", eth_dev->data->port_id);
        eth_dev->data->mac_addrs = NULL;
 
-       parent_bp = rep->parent_dev->data->dev_private;
-       if (!parent_bp) {
+       if (!bnxt_rep_check_parent(rep)) {
                PMD_DRV_LOG(DEBUG, "BNXT Port:%d already freed\n",
                            eth_dev->data->port_id);
                return 0;
        }
+       parent_bp = rep->parent_dev->data->dev_private;
 
        parent_bp->num_reps--;
        vf_id = rep->vf_id;
@@ -539,11 +547,12 @@ int bnxt_rep_dev_info_get_op(struct rte_eth_dev *eth_dev,
        int rc = 0;
 
        /* MAC Specifics */
-       parent_bp = rep_bp->parent_dev->data->dev_private;
-       if (!parent_bp) {
-               PMD_DRV_LOG(ERR, "Rep parent NULL!\n");
+       if (!bnxt_rep_check_parent(rep_bp)) {
+               /* Need not be an error scenario, if parent is closed first */
+               PMD_DRV_LOG(INFO, "Rep parent port does not exist.\n");
                return rc;
        }
+       parent_bp = rep_bp->parent_dev->data->dev_private;
        PMD_DRV_LOG(DEBUG, "Representor dev_info_get_op\n");
        dev_info->max_mac_addrs = parent_bp->max_l2_ctx;
        dev_info->max_hash_mac_addrs = 0;
-- 
2.39.2 (Apple Git-143)

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