From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Thu, 24 Feb 2022 17:53:25 +0300
Subject: net/mlx5e: TC, Fix use after free in
 mlx5e_clone_flow_attr_for_post_act()
Patch-mainline: v5.18-rc1
Git-commit: 371c2b349d927e81710f6ac2826d7fcb0374280f
References: jsc#PED-1549

This returns freed memory leading to a use after free.  It's supposed to
return NULL.

Fixes: 8300f225268b ("net/mlx5e: Create new flow attr for multi table actions")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Roi Dayan <roid@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_tc.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
@@ -3410,7 +3410,7 @@ mlx5e_clone_flow_attr_for_post_act(struc
 	if (!attr2 || !parse_attr) {
 		kvfree(parse_attr);
 		kfree(attr2);
-		return attr2;
+		return NULL;
 	}
 
 	memcpy(attr2, attr, attr_sz);