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-ITV6EytK63@https.bugzilla.kernel.org/>
Date:   Mon, 26 Mar 2018 15:59:54 +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

--- Comment #3 from Wen Xu (wen.xu@...ech.edu) ---
Thank you for the quick response! By the way, I wonder whether I can get CVE
numbers assigned for such kinda issues I reported recently?(In reply to
Theodore Tso from comment #2)
> Created attachment 274933 [details]
> 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.

Thank you for the quick response! By the way, I wonder whether I can get CVE
numbers assigned for such kinda issues I reported recently?

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