[PATCH 5.4 330/411] net/mlx5: Dont use already freed action pointer

Greg Kroah-Hartman
2022-06-13T11:41:14Z

From: Leon Romanovsky <leonro@nvidia.com>

[ Upstream commit 80b2bd737d0e833e6a2b77e482e5a714a79c86a4 ]

The call to mlx5dr_action_destroy() releases "action" memory. That
pointer is set to miss_action later and generates the following smatch
error:

drivers/net/ethernet/mellanox/mlx5/core/steering/fs_dr.c:53 set_miss_action()
warn: 'action' was already freed.

Make sure that the pointer is always valid by setting NULL after destroy.

Fixes: 6a48faeeca10 ("net/mlx5: Add direct rule fs_cmd implementation")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/ethernet/mellanox/mlx5/core/steering/fs_dr.c | 9 ++++-----
1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/steering/fs_dr.c b/drivers/net/ethernet/mellanox/mlx5/core/steering/fs_dr.c
index 348f02e336f6..d64368506754 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/steering/fs_dr.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/steering/fs_dr.c
@@ -43,11 +43,10 @@ static int set_miss_action(struct mlx5_flow_root_namespace *ns,
err = mlx5dr_table_set_miss_action(ft->fs_dr_table.dr_table, action);
if (err && action) {
err = mlx5dr_action_destroy(action);
- if (err) {
- action = NULL;
- mlx5_core_err(ns->dev, "Failed to destroy action (%d)\n",
- err);
- }
+ if (err)
+ mlx5_core_err(ns->dev,
+ "Failed to destroy action (%d)\n", err);
+ action = NULL;
}
ft->fs_dr_table.miss_action = action;
if (old_miss_action) {
--
2.35.1