linux-kernel - [PATCH v2] nfp: flower: handle acti

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Message-Id: <20240308142540.9674-1-duoming@zju.edu.cn>
Date: Fri,  8 Mar 2024 22:25:40 +0800
From: Duoming Zhou <duoming@....edu.cn>
To: linux-kernel@...r.kernel.org
Cc: yinjun.zhang@...igine.com,
	netdev@...r.kernel.org,
	oss-drivers@...igine.com,
	christophe.jaillet@...adoo.fr,
	horms@...nel.org,
	pabeni@...hat.com,
	edumazet@...gle.com,
	davem@...emloft.net,
	kuba@...nel.org,
	louis.peens@...igine.com,
	Duoming Zhou <duoming@....edu.cn>
Subject: [PATCH v2] nfp: flower: handle acti_netdevs allocation failure

The kmalloc_array() in nfp_fl_lag_do_work() will return null, if
the physical memory has run out. As a result, if we dereference
the acti_netdevs, the null pointer dereference bugs will happen.

This patch adds a check to judge whether allocation failure occurs.
If it happens, the delayed work will be rescheduled and try again.

Fixes: bb9a8d031140 ("nfp: flower: monitor and offload LAG groups")
Signed-off-by: Duoming Zhou <duoming@....edu.cn>
---
Changes in v2:
  - Remove print warnings on allocation failures.

 drivers/net/ethernet/netronome/nfp/flower/lag_conf.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/ethernet/netronome/nfp/flower/lag_conf.c b/drivers/net/ethernet/netronome/nfp/flower/lag_conf.c
index 361d7c495e2..2c7bd6e80d9 100644
--- a/drivers/net/ethernet/netronome/nfp/flower/lag_conf.c
+++ b/drivers/net/ethernet/netronome/nfp/flower/lag_conf.c
@@ -337,6 +337,11 @@ static void nfp_fl_lag_do_work(struct work_struct *work)
 
 		acti_netdevs = kmalloc_array(entry->slave_cnt,
 					     sizeof(*acti_netdevs), GFP_KERNEL);
+		if (!acti_netdevs) {
+			schedule_delayed_work(&lag->work,
+					      NFP_FL_LAG_DELAY);
+			continue;
+		}
 
 		/* Include sanity check in the loop. It may be that a bond has
 		 * changed between processing the last notification and the
-- 
2.17.1