[PATCH v2 net] net: Add error pointer check in bcmsysport.c

[Dipendra Khadka <kdipendra88@gmail.com>]

Add error pointer checks in bcm_sysport_map_queues() and
bcm_sysport_unmap_queues() before deferencing 'dp'.

Signed-off-by: Dipendra Khadka <kdipendra88@gmail.com>
---
v2: 
  - Change the subject of the patch to net
v1:  https://lore.kernel.org/all/20240922181739.50056-1-kdipendra88@gmail.com/
 drivers/net/ethernet/broadcom/bcmsysport.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/ethernet/broadcom/bcmsysport.c b/drivers/net/ethernet/broadcom/bcmsysport.c
index c9faa8540859..97d2ff2329cb 100644
--- a/drivers/net/ethernet/broadcom/bcmsysport.c
+++ b/drivers/net/ethernet/broadcom/bcmsysport.c
@@ -2337,6 +2337,9 @@ static int bcm_sysport_map_queues(struct net_device *dev,
 	unsigned int num_tx_queues;
 	unsigned int q, qp, port;
 
+	if (IS_ERR(dp))
+		return PRT_ERR(dp);
+
 	/* We can't be setting up queue inspection for non directly attached
 	 * switches
 	 */
@@ -2392,6 +2395,9 @@ static int bcm_sysport_unmap_queues(struct net_device *dev,
 	unsigned int num_tx_queues;
 	unsigned int q, qp, port;
 
+	if (IS_ERR(dp))
+		return PTR_ERR(dp);
+
 	port = dp->index;
 
 	num_tx_queues = slave_dev->real_num_tx_queues;
-- 
2.43.0