From nobody Mon Jun 8 06:36:53 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 54A7B40B37A; Fri, 5 Jun 2026 09:16:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780650962; cv=none; b=JkjpOdxYAlVlGIDt/W8XTbrUlVTDq5hIP0ZYVp29TPB3pcAJFUGxmoYy5W/u63BAFnsJk2IswY2wZOibinDzWvBeBx9NmLnox8asxZyjZge1it5XmGNbmqukRnH3fEAdzHwRvw3efKDebUhvNLc2Q33vfzryRCrdWcRG4MkDjEc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780650962; c=relaxed/simple; bh=NObFgcKziq04KZkITqs/JX/pdLy2MW6/VJnlIPK2Q78=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=kDmULJ46VMM6NzYtkYOVOExTedzp9JsCirvNTIIeC8i+wiB6d6YEi6/fMt00E8jNszqQfqMY9HwywdPYtjd/sKIQtcAnm5zJn9LwU5N2z573vnUXlq2DcvnZVIMUPnUxXgMMdKvT3nwbr2ogEioMslfb3S2isE0y+Do3YmLwfgA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=I5nkJg3v; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="I5nkJg3v" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E035B1F00893; Fri, 5 Jun 2026 09:15:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1780650961; bh=jj2bkCKbqZy8q/+y9uBjWHCDSlpn7vgFnPVzyztV20s=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=I5nkJg3voJHBQvuna7w3/DTg0lzI2UnGOE3OpaXp9mxCY7qzzFc4PxfNI48ExCS97 POyLdvAJBeQaJQUY8CdNl9N83vfc24QTZJhV9fvBpgDVrALEfezVtYa65rPRIr8Lh2 XYU7NmQ7FAr+JhZ0L91SbMneav9tCXg3rH1DtyAzSoxjbNE2ttRIYeySL/u+vGW1QT OvM/Bu2l96+TMzYhner5Df0cEdKvsKK50cellXfqjV0YBOZ3TdS5twwUKfZ/6iO99f MdINp+ASIPCeoFfAJ/KVH4eS4JUW+SEZ6jdA+7ZzVw0Ujlnd0oDzAJIrMWvOy3TplS IGciYDPSE7GAQ== From: Yu Kuai To: Song Liu , Yu Kuai Cc: Li Nan , Xiao Ni , linux-raid@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] md/md-llbitmap: clamp state-machine walks to tracked bits Date: Fri, 5 Jun 2026 17:15:20 +0800 Message-ID: <20260605091527.2463539-14-yukuai@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260605091527.2463539-1-yukuai@kernel.org> References: <20260605091527.2463539-1-yukuai@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Yu Kuai llbitmap_state_machine() can be called with an end bit beyond llbitmap->chunks. In particular, llbitmap_cond_end_sync() passes sector >> chunkshift, and sector can reach the tracked boundary exactly. Clamp the state-machine range to llbitmap->chunks so it cannot walk past the tracked bitmap. Signed-off-by: Yu Kuai --- drivers/md/md-llbitmap.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/md/md-llbitmap.c b/drivers/md/md-llbitmap.c index 6783f1b3ddf0..65d2fd1979e5 100644 --- a/drivers/md/md-llbitmap.c +++ b/drivers/md/md-llbitmap.c @@ -980,11 +980,14 @@ static enum llbitmap_state llbitmap_state_machine(str= uct llbitmap *llbitmap, =20 if (action =3D=3D BitmapActionInit) { llbitmap_init_state(llbitmap); return BitNone; } - + if (start >=3D llbitmap->chunks) + return BitNone; + if (end >=3D llbitmap->chunks) + end =3D llbitmap->chunks - 1; while (start <=3D end) { enum llbitmap_state c =3D llbitmap_read(llbitmap, start); =20 if (c < 0 || c >=3D BitStateCount) { pr_err("%s: invalid bit %lu state %d action %d, forcing resync\n", --=20 2.51.0