linux-kernel - [PATCH net v3] nfp: flower: Added pointer check and continue

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Message-Id: <20221118080317.119749-1-arefev@swemel.ru>
Date:   Fri, 18 Nov 2022 11:03:17 +0300
From:   Denis Arefev <arefev@...mel.ru>
To:     Simon Horman <simon.horman@...ronome.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>, oss-drivers@...ronome.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        lvc-project@...uxtesting.org, trufanov@...mel.ru, vfh@...mel.ru
Subject: [PATCH net v3] nfp: flower: Added pointer check and continue

Return value of a function 'kmalloc_array' is dereferenced at 
lag_conf.c:347 without checking for null, 
but it is usually checked for this function.

Found by Linux Verification Center (linuxtesting.org) with SVACE.
Fixes: bb9a8d031140 ("nfp: flower: monitor and offload LAG groups")
Signed-off-by: Denis Arefev <arefev@...mel.ru>
---
 drivers/net/ethernet/netronome/nfp/flower/lag_conf.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/netronome/nfp/flower/lag_conf.c b/drivers/net/ethernet/netronome/nfp/flower/lag_conf.c
index 63907aeb3884..1aaec4cb9f55 100644
--- a/drivers/net/ethernet/netronome/nfp/flower/lag_conf.c
+++ b/drivers/net/ethernet/netronome/nfp/flower/lag_conf.c
@@ -276,7 +276,7 @@ static void nfp_fl_lag_do_work(struct work_struct *work)
 
 	mutex_lock(&lag->lock);
 	list_for_each_entry_safe(entry, storage, &lag->group_list, list) {
-		struct net_device *iter_netdev, **acti_netdevs;
+		struct net_device *iter_netdev, **acti_netdevs = NULL;
 		struct nfp_flower_repr_priv *repr_priv;
 		int active_count = 0, slaves = 0;
 		struct nfp_repr *repr;
@@ -308,6 +308,10 @@ 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
-- 
2.25.1