linux-kernel - Re: [PATCH] mm/filemap: fix NULL pointer dereference in do_read_cache

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Message-ID: <aR1bAzXYJF5TicnS@infradead.org>
Date: Tue, 18 Nov 2025 21:52:03 -0800
From: Christoph Hellwig <hch@...radead.org>
To: Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc: "Darrick J. Wong" <djwong@...nel.org>,
	Matthew Wilcox <willy@...radead.org>,
	Christoph Hellwig <hch@...radead.org>,
	SHAURYA RANE <ssrane_b23@...vjti.ac.in>, akpm@...ux-foundation.org,
	shakeel.butt@...ux.dev, eddyz87@...il.com, andrii@...nel.org,
	ast@...nel.org, linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, linux-kernel-mentees@...ts.linux.dev,
	skhan@...uxfoundation.org, david.hunter.linux@...il.com,
	khalid@...nel.org,
	syzbot+09b7d050e4806540153d@...kaller.appspotmail.com,
	bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH] mm/filemap: fix NULL pointer dereference in
 do_read_cache_folio()

On Tue, Nov 18, 2025 at 11:38:36AM -0800, Andrii Nakryiko wrote:
> We have plenty of build ID tests in BPF selftest that validate this
> functionality:

And none of them is run on a wide variety of file systems, presumably
because they are only run by BFP developers.

IFF we allow for magic file access methods it needs to be part of
regular file system testing.