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net/mlx5: free mlx5_st_idx_data on final dealloc

In the Linux kernel, the following vulnerability has been resolved: net/mlx5: free mlx5_st_idx_data on final dealloc Workloads that repeatedly allocate and release mkeys carrying TPH steering-tag hints (e.g. churning RDMA MRs) leak one struct mlx5_st_idx_data per cycle; kmemleak flags it as unreferenced and the kmalloc slab grows over time. When the last reference to an ST table entry is dropped, mlx5_st_dealloc_index() removed the entry from idx_xa but the backing mlx5_st_idx_data allocation was never freed. Free idx_data after the xa_erase() so the lifetime of the bookkeeping struct matches the lifetime of the ST entry it tracks.

Affected products

Linux
  • <6.17
  • ==6.17
  • =<*
  • <6eb4cf2fa8997f62c11e0006dc010a1fd89c5a75
  • <df6134b527a88b3e65ba6ae5073664af091d5fd2
  • =<6.18.*
  • =<7.1.*
  • <262da8b6ea03d01ee7ed01ad309e4c89941f6b14