linux-kernel - Re: [GIT PULL] fscrypt fix for 6.1-rc3

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Date:   Fri, 28 Oct 2022 09:53:03 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Eric Biggers <ebiggers@...nel.org>
Cc:     linux-fscrypt@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, "Theodore Ts'o" <tytso@....edu>,
        Jaegeuk Kim <jaegeuk@...nel.org>
Subject: Re: [GIT PULL] fscrypt fix for 6.1-rc3

On Thu, Oct 27, 2022 at 8:13 PM Eric Biggers <ebiggers@...nel.org> wrote:
>
> Thanks Linus.  That makes sense in general, but in this case ->s_master_keys
> gets used in the middle of the function, in fscrypt_put_master_key_activeref().

Ouch. I tried to look for things like that, but it's clearly indirect
through 'mk' so I missed it.

All the callers except for put_crypt_info() do seem to have the 'sb'
pointer, and I _think_ sb is inode->i_sb in that case. And this seems
to *literally* be the only use of 'mk->mk_sb' in the whole data
structure, so I think it's all wrong, and that field just shouldn't
exist at all, but be passed into the (only) user as an argument.

Oh well. Whatever. I think the code is ugly, but it is what it is. It
may not be worth the churn of fixing.

              Linus