linux-hardening - Re: [PATCH 3/5] fs: Add DEFINE

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Message-ID: <20231202212846.GQ38156@ZenIV>
Date: Sat, 2 Dec 2023 21:28:46 +0000
From: Al Viro <viro@...iv.linux.org.uk>
To: Kees Cook <keescook@...omium.org>
Cc: "Guilherme G. Piccoli" <gpiccoli@...lia.com>,
	Christian Brauner <brauner@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-fsdevel@...r.kernel.org, Tony Luck <tony.luck@...el.com>,
	linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH 3/5] fs: Add DEFINE_FREE for struct inode

On Sat, Dec 02, 2023 at 01:22:13PM -0800, Kees Cook wrote:
> Allow __free(iput) markings for easier cleanup on inode allocations.

NAK.  That's a bloody awful idea for that particular data type, since
	1) ERR_PTR(...) is not uncommon and passing it to iput() is a bug.
	2) the common pattern is to have reference-consuming primitives,
with failure exits normally *not* having to do iput() at all.

Please, don't.