[Bug 200465] null ptr dereference in fscrypt_do_page_crypto() when operating a file on a corrupted f2fs image

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https://bugzilla.kernel.org/show_bug.cgi?id=200465

--- Comment #4 from Wen Xu (wen.xu@gatech.edu) ---
(In reply to Chao Yu from comment #3)
> Steve,
> 
> I figure out that patch to solve issue which I encounter with image attached
> by Wen Xu, the bug can be triggered with below scripts:
> - mount image /mnt/f2fs/
> - cd /mnt/f2fs/foo/bar/
> - ls -l
> 
> After applying that patch, the problem was gone.
> 
> But when the bug triggeres, related call stack is not the same as reported
> one, also I can't reproduce reported call stack with the method provided
> from Wen Xu.
> 
> I guess the right producing way is adding master key for encrypted file, I'd
> like to confirm with Wen Xu.

Hi Chao,

Sorry for a late reply! Eh the first thing is that I never did anything like
adding master key for encrypted file. Second, I feel I pasted wrong
(mismatched) kernel message/PoC...but unfortunately I do not have a local copy
on my laptop now.

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