linux-ext4 - [Bug 199179] Invalid pointer dereference when mounting crafted ext4 image in ext4_process_freed

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Message-ID: <bug-199179-13602-Ve81Ds4XKd@https.bugzilla.kernel.org/>
Date:   Mon, 26 Mar 2018 01:48:05 +0000
From:   bugzilla-daemon@...zilla.kernel.org
To:     linux-ext4@...nel.org
Subject: [Bug 199179] Invalid pointer dereference when mounting crafted ext4
 image in ext4_process_freed_data

https://bugzilla.kernel.org/show_bug.cgi?id=199179

Theodore Tso (tytso@....edu) changed:

           What    |Removed                     |Added
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                 CC|                            |tytso@....edu

--- Comment #2 from Theodore Tso (tytso@....edu) ---
Created attachment 274933
  --> https://bugzilla.kernel.org/attachment.cgi?id=274933&action=edit
Proposed patch to fix the reported bug.

Thanks for reporting this bug.  The attached should address the problem.

    If the root directory has an i_links_count of zero, then when the file
    system is mounted, then when ext4_fill_super() notices the problem and
    tries to call iput() the root directory in the error return path,
    ext4_evict_inode() will try to free the inode on disk, before all of
    the file system structures are set up, and this will result in an OOPS
    caused by a NULL pointer dereference.

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