[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 #3 from Chao Yu (chao@kernel.org) ---
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.

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