1. 14 Sep, 2023 1 commit
    • Li Zetao's avatar
      jbd2: Fix memory leak in journal_init_common() · 1bb0763f
      Li Zetao authored
      There is a memory leak reported by kmemleak:
      
        unreferenced object 0xff11000105903b80 (size 64):
          comm "mount", pid 3382, jiffies 4295032021 (age 27.826s)
          hex dump (first 32 bytes):
            04 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00  ................
            ff ff ff ff 00 00 00 00 00 00 00 00 00 00 00 00  ................
          backtrace:
            [<ffffffffae86ac40>] __kmalloc_node+0x50/0x160
            [<ffffffffaf2486d8>] crypto_alloc_tfmmem.isra.0+0x38/0x110
            [<ffffffffaf2498e5>] crypto_create_tfm_node+0x85/0x2f0
            [<ffffffffaf24a92c>] crypto_alloc_tfm_node+0xfc/0x210
            [<ffffffffaedde777>] journal_init_common+0x727/0x1ad0
            [<ffffffffaede1715>] jbd2_journal_init_inode+0x2b5/0x500
            [<ffffffffaed786b5>] ext4_load_and_init_journal+0x255/0x2440
            [<ffffffffaed8b423>] ext4_fill_super+0x8823/0xa330
            ...
      
      The root cause was traced to an error handing path in journal_init_common()
      when malloc memory failed in register_shrinker(). The checksum driver is
      used to reference to checksum algorithm via cryptoapi and the user should
      release the memory when the driver is no longer needed or the journal
      initialization failed.
      
      Fix it by calling crypto_free_shash() on the "err_cleanup" error handing
      path in journal_init_common().
      
      Fixes: c3071308 ("jbd2: move load_superblock() into journal_init_common()")
      Signed-off-by: default avatarLi Zetao <lizetao1@huawei.com>
      Reviewed-by: default avatarJan Kara <jack@suse.cz>
      Reviewed-by: default avatarZhang Yi <yi.zhang@huawei.com>
      Reviewed-by: default avatarRitesh Harjani (IBM) <ritesh.list@gmail.com>
      Link: https://lore.kernel.org/r/20230911025138.983101-1-lizetao1@huawei.comSigned-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
      1bb0763f
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