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@zju.edu.cn>
Reviewed-by: Louis Peens <louis.peens@corigine.com>
Link: https://lore.kernel.org/r/20240308142540.9674-1-duoming@zju.edu.cn
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/netronome/nfp/flower/lag_conf.c b/drivers/net/ethernet/netronome/nfp/flower/lag_conf.c
index 361d7c4..2c7bd6e 100644 (file)
--- 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