From: Li RongQing <redacted>

mlx5_st_alloc_index() allocates an mlx5_st_idx_data object for
each new steering tag table index and stores it in the xarray.
When the last user releases the index, mlx5_st_dealloc_index()
removes the entry from the xarray but did not free the backing
object, leaking memory.

Free idx_data after erasing the xarray entry once the refcount
reaches zero.

Fixes: 888a7776f4fb0 ("net/mlx5: Add support for device steering tag")
Signed-off-by: Li RongQing <redacted>
---
 drivers/net/ethernet/mellanox/mlx5/core/lib/st.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/st.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/st.c
index 997be91..7cedc34 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/st.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/st.c

@@ -175,6 +175,7 @@ int mlx5_st_dealloc_index(struct mlx5_core_dev *dev, u16 st_index)
 
 	if (refcount_dec_and_test(&idx_data->usecount)) {
 		xa_erase(&st->idx_xa, st_index);
+		kfree(idx_data);
 		/* We leave PCI config space as was before, no mkey will refer to it */
 	}
 

-- 
2.9.4