** Tags added: kernel-daily-bug

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https://bugs.launchpad.net/bugs/1934822

Title:
  Possible memory leak of flow_block_cb

Status in linux-bluefield package in Ubuntu:
  Invalid
Status in linux-bluefield source package in Focal:
  Fix Released

Bug description:
  * Explain the bug(s)

  When cleaning up the nf_table in tcf_ct_flow_table_cleanup_work
  there is no guarantee that the callback list, added to by
  nf_flow_table_offload_add_cb, is empty. This means that it is
  possible that the flow_block_cb memory allocated will be lost.

  
  * brief explanation of fixes

  Fix this by iterating the list and freeing the flow_block_cb entries
  before freeing the nf_table entry (via freeing ct_ft).

  * How to test

  With mlx5 driver registers flow block callback, cleaning up rule with action 
ct
  frees the ct_ft but with memory leak.

  * What it could break.

  Nothing breaks, memory leak is fixed.

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