6.6-stable review patch. If anyone has any objections, please let me know.
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From: Chris Mi cmi@nvidia.com
[ Upstream commit 025f2b85a5e5a46df14ecf162c3c80a957a36d0b ]
The cited commit allocates a new modify header to replace the old one when updating CT entry. But if failed to allocate a new one, eg. exceed the max number firmware can support, modify header will be an error pointer that will trigger a panic when deallocating it. And the old modify header point is copied to old attr. When the old attr is freed, the old modify header is lost.
Fix it by restoring the old attr to attr when failed to allocate a new modify header context. So when the CT entry is freed, the right modify header context will be freed. And the panic of accessing error pointer is also fixed.
Fixes: 94ceffb48eac ("net/mlx5e: Implement CT entry update") Signed-off-by: Chris Mi cmi@nvidia.com Signed-off-by: Tariq Toukan tariqt@nvidia.com Reviewed-by: Wojciech Drewek wojciech.drewek@intel.com Link: https://patch.msgid.link/20240730061638.1831002-8-tariqt@nvidia.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/mellanox/mlx5/core/en/tc_ct.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/tc_ct.c b/drivers/net/ethernet/mellanox/mlx5/core/en/tc_ct.c index fadfa8b50bebe..8c4e3ecef5901 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/en/tc_ct.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/en/tc_ct.c @@ -920,6 +920,7 @@ mlx5_tc_ct_entry_replace_rule(struct mlx5_tc_ct_priv *ct_priv, mlx5_tc_ct_entry_destroy_mod_hdr(ct_priv, zone_rule->attr, mh); mlx5_put_label_mapping(ct_priv, attr->ct_attr.ct_labels_id); err_mod_hdr: + *attr = *old_attr; kfree(old_attr); err_attr: kvfree(spec);