From: David Howells <dhowells@redhat.com>
To: Max Kellermann <max.kellermann@ionos.com>
Cc: dhowells@redhat.com, netfs@lists.linux.dev,
linux-kernel@vger.kernel.org, stable@vger.kernel.org
Subject: Re: [PATCH v6.13] fs/netfs/read_pgpriv2: skip folio queues without `marks3`
Date: Fri, 14 Feb 2025 12:42:37 +0000 [thread overview]
Message-ID: <3977863.1739536957@warthog.procyon.org.uk> (raw)
In-Reply-To: <20250210223144.3481766-1-max.kellermann@ionos.com>
Max Kellermann <max.kellermann@ionos.com> wrote:
> At the beginning of the function, folio queues with marks3==0 are
> skipped, but after that, the `marks3` field is ignored. If one such
> queue is found, `slot` is set to 64 (because `__ffs(0)==64`), leading
> to a buffer overflow in the folioq_folio() call. The resulting crash
> may look like this:
>
> BUG: kernel NULL pointer dereference, address: 0000000000000000
> ...
>
> Fixes: ee4cdf7ba857 ("netfs: Speed up buffered reading")
> Cc: stable@vger.kernel.org
> Signed-off-by: Max Kellermann <max.kellermann@ionos.com>
Signed-off-by: David Howells <dhowells@redhat.com>
prev parent reply other threads:[~2025-02-14 12:42 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-02-10 22:31 [PATCH v6.13] fs/netfs/read_pgpriv2: skip folio queues without `marks3` Max Kellermann
2025-02-10 22:34 ` kernel test robot
2025-02-11 6:29 ` Greg KH
2025-02-11 8:05 ` Max Kellermann
2025-02-11 8:19 ` Greg KH
2025-02-14 12:42 ` David Howells [this message]
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