1. 16 Jun, 2009 8 commits
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  3. 10 Jun, 2009 2 commits
  4. 09 Jun, 2009 1 commit
    • Jan Kara's avatar
      jbd: fix race in buffer processing in commit code · a61d90d7
      Jan Kara authored
      In commit code, we scan buffers attached to a transaction.  During this
      scan, we sometimes have to drop j_list_lock and then we recheck whether
      the journal buffer head didn't get freed by journal_try_to_free_buffers().
       But checking for buffer_jbd(bh) isn't enough because a new journal head
      could get attached to our buffer head.  So add a check whether the journal
      head remained the same and whether it's still at the same transaction and
      list.
      
      This is a nasty bug and can cause problems like memory corruption (use after
      free) or trigger various assertions in JBD code (observed).
      Signed-off-by: default avatarJan Kara <jack@suse.cz>
      Cc: <stable@kernel.org>
      Cc: <linux-ext4@vger.kernel.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      a61d90d7