linux-kernel - [PATCH 6.1 230/451] nfp: flower: handle acti

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Date: Sun, 24 Mar 2024 19:08:26 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Duoming Zhou <duoming@....edu.cn>,
	Louis Peens <louis.peens@...igine.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Sasha Levin <sashal@...nel.org>
Subject: [PATCH 6.1 230/451] nfp: flower: handle acti_netdevs allocation failure

From: Duoming Zhou <duoming@....edu.cn>

[ Upstream commit 84e95149bd341705f0eca6a7fcb955c548805002 ]

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>
Reviewed-by: Louis Peens <louis.peens@...igine.com>
Link: https://lore.kernel.org/r/20240308142540.9674-1-duoming@zju.edu.cn
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 e92860e20a24a..c6a2c302a8c8b 100644
--- a/drivers/net/ethernet/netronome/nfp/flower/lag_conf.c
+++ b/drivers/net/ethernet/netronome/nfp/flower/lag_conf.c
@@ -308,6 +308,11 @@ 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
-- 
2.43.0