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From: Andrew Morton <akpm@linux-foundation.org>
To: Vincent Mailhol <mailhol@kernel.org>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/2] lib/ucs2_string.c: fix out-of-bounds read in ucs2_strnlen()
Date: Wed, 22 Jul 2026 16:01:37 -0700	[thread overview]
Message-ID: <20260722160137.51230dfcf70fd246cf7208ab@linux-foundation.org> (raw)
In-Reply-To: <20260722-fix-ucs2_strnlen-v1-2-ba5bade2b026@kernel.org>

On Wed, 22 Jul 2026 23:04:53 +0200 Vincent Mailhol <mailhol@kernel.org> wrote:

> ucs2_strnlen() checks the current character before checking whether the
> caller-provided maximum length has been reached. If the input is not
> NUL-terminated within that bound, the loop can read one ucs2_char_t past
> the limit.

Is there a known way of hitting this from userspace?  If so, and if the
effect is at all serious then we should prepare a backportable fix
against current mainline - that whitespace tweaking patch can come
later.

Also, AI review points at a few possible pre-existing problems in there
which might interest you:
	https://sashiko.dev/#/patchset/20260722-fix-ucs2_strnlen-v1-0-ba5bade2b026@kernel.org

Thanks.

  reply	other threads:[~2026-07-22 23:01 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-07-22 21:04 [PATCH 0/2] " Vincent Mailhol
2026-07-22 21:04 ` [PATCH 1/2] lib/ucs2_string.c: fix indentation Vincent Mailhol
2026-07-22 21:04 ` [PATCH 2/2] lib/ucs2_string.c: fix out-of-bounds read in ucs2_strnlen() Vincent Mailhol
2026-07-22 23:01   ` Andrew Morton [this message]
2026-07-23 19:38     ` Vincent Mailhol

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