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Date:   Wed, 07 Dec 2022 03:06:11 +0000
Subject: [Bug 216781] New: wrong check buffer_head in ext4_simulate_fail_bh

            Bug ID: 216781
           Summary: wrong check buffer_head in ext4_simulate_fail_bh
           Product: File System
           Version: 2.5
    Kernel Version: 6.0
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: low
          Priority: P1
         Component: ext4
        Regression: No

ext4_simulate_fail_bh used at
but it seems bh(buffer_head) can only be ptr or NULL, so it is wrong to use
IS_ERR in ext4_simulate_fail_bh at

replace IS_ERR with IS_ERR_OR_NULL here.

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