[lvc-project] [PATCH 5.10.y] ionic: catch failure from devlink_alloc

[Vasiliy Kovalev]

From: Shannon Nelson <shannon.nelson at amd.com>

commit 4a54903ff68ddb33b6463c94b4eb37fc584ef760 upstream.

Add a check for NULL on the alloc return.  If devlink_alloc() fails and
we try to use devlink_priv() on the NULL return, the kernel gets very
unhappy and panics. With this fix, the driver load will still fail,
but at least it won't panic the kernel.

Fixes: df69ba43217d ("ionic: Add basic framework for IONIC Network device driver")
Signed-off-by: Shannon Nelson <shannon.nelson at amd.com>
Reviewed-by: Simon Horman <simon.horman at corigine.com>
Reviewed-by: Jiri Pirko <jiri at nvidia.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
[ kovalev: bp to fix CVE-2023-53470 ]
Signed-off-by: Vasiliy Kovalev <kovalev at altlinux.org>
---
 drivers/net/ethernet/pensando/ionic/ionic_devlink.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_devlink.c b/drivers/net/ethernet/pensando/ionic/ionic_devlink.c
index 3d94064c685d..52ebecf2521e 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_devlink.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_devlink.c
@@ -65,6 +65,8 @@ struct ionic *ionic_devlink_alloc(struct device *dev)
 	struct devlink *dl;
 
 	dl = devlink_alloc(&ionic_dl_ops, sizeof(struct ionic));
+	if (!dl)
+		return NULL;
 
 	return devlink_priv(dl);
 }
-- 
2.50.1