linux-ext4 - Re: [PATCH] fscrypt: remove reachable WARN in fscrypt_setup_iv_ino_lblk_32

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Date:   Fri, 6 Nov 2020 09:50:59 -0800
From:   Eric Biggers <ebiggers@...nel.org>
To:     linux-fscrypt@...r.kernel.org
Cc:     linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
        "Theodore Y. Ts'o" <tytso@....edu>
Subject: Re: [PATCH] fscrypt: remove reachable WARN in
 fscrypt_setup_iv_ino_lblk_32_key()

On Fri, Oct 30, 2020 at 05:45:56PM -0700, Eric Biggers wrote:
> From: Eric Biggers <ebiggers@...gle.com>
> 
> I_CREATING isn't actually set until the inode has been assigned an inode
> number and inserted into the inode hash table.  So the WARN_ON() in
> fscrypt_setup_iv_ino_lblk_32_key() is wrong, and it can trigger when
> creating an encrypted file on ext4.  Remove it.
> 
> This was sometimes causing xfstest generic/602 to fail on ext4.  I
> didn't notice it before because due to a separate oversight, new inodes
> that haven't been assigned an inode number yet don't necessarily have
> i_ino == 0 as I had thought, so by chance I never saw the test fail.
> 
> Fixes: a992b20cd4ee ("fscrypt: add fscrypt_prepare_new_inode() and fscrypt_set_context()")
> Reported-by: Theodore Y. Ts'o <tytso@....edu>
> Signed-off-by: Eric Biggers <ebiggers@...gle.com>

Applied to fscrypt.git#for-stable for 5.10.

- Eric