patch 'net/bnxt: fix null pointer dereference' has been queued to stable release 23.11.1

[Xueming Li]

Hi,

FYI, your patch has been queued to stable release 23.11.1

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 04/15/24. So please
shout if anyone has objections.

Also note that after the patch there's a diff of the upstream commit vs the
patch applied to the branch. This will indicate if there was any rebasing
needed to apply to the stable branch. If there were code changes for rebasing
(ie: not only metadata diffs), please double check that the rebase was
correctly done.

Queued patches are on a temporary branch at:
https://git.dpdk.org/dpdk-stable/log/?h=23.11-staging

This queued commit can be viewed at:
https://git.dpdk.org/dpdk-stable/commit/?h=23.11-staging&id=a71de447a2351b7c5b4f95446b5382e253415232

Thanks.

Xueming Li <xuemingl at nvidia.com>

---
>From a71de447a2351b7c5b4f95446b5382e253415232 Mon Sep 17 00:00:00 2001
From: Kalesh AP <kalesh-anakkur.purayil at broadcom.com>
Date: Wed, 7 Feb 2024 01:19:02 -0800
Subject: [PATCH] net/bnxt: fix null pointer dereference
Cc: Xueming Li <xuemingl at nvidia.com>

[ upstream commit 68eeafdef4db7362ff5307995b670a98f65f2493 ]

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")

Signed-off-by: Kalesh AP <kalesh-anakkur.purayil at broadcom.com>
Reviewed-by: Ajit Khaparde <ajit.khaparde at broadcom.com>
Reviewed-by: Somnath Kotur <somnath.kotur at 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 a15f993328..a7b75b543e 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;
-- 
2.34.1

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2024-04-13 20:43:05.800972282 +0800
+++ 0021-net-bnxt-fix-null-pointer-dereference.patch	2024-04-13 20:43:04.937754010 +0800
@@ -1 +1 @@
-From 68eeafdef4db7362ff5307995b670a98f65f2493 Mon Sep 17 00:00:00 2001
+From a71de447a2351b7c5b4f95446b5382e253415232 Mon Sep 17 00:00:00 2001
@@ -4,0 +5,3 @@
+Cc: Xueming Li <xuemingl at nvidia.com>
+
+[ upstream commit 68eeafdef4db7362ff5307995b670a98f65f2493 ]
@@ -14 +16,0 @@
-Cc: stable at dpdk.org
@@ -24 +26 @@
-index 3a4720bc3c..edcc27f556 100644
+index a15f993328..a7b75b543e 100644