Re: [PATCH] net/mlx5e: TC, Fix use after free in mlx5e_clone_flow_attr_for_post_act()

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On 2022-02-24 4:53 PM, Dan Carpenter wrote:
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@xxxxxxxxxx>
---
This goes through Saeed's tree not the net tree.

  drivers/net/ethernet/mellanox/mlx5/core/en_tc.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
index 76a015dfc5fc..c0776a4a3845 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
@@ -3398,7 +3398,7 @@ mlx5e_clone_flow_attr_for_post_act(struct mlx5_flow_attr *attr,
  	if (!attr2 || !parse_attr) {
  		kvfree(parse_attr);
  		kfree(attr2);
-		return attr2;
+		return NULL;
  	}
memcpy(attr2, attr, attr_sz);

hi, I noticed your fix now and already reviewed same fix from Colin

https://patchwork.kernel.org/project/netdevbpf/patch/20220224221525.147744-1-colin.i.king@xxxxxxxxx/

so just need to take either one.
thanks

Reviewed-by: Roi Dayan <roid@xxxxxxxxxx>



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