From mboxrd@z Thu Jan 1 00:00:00 1970 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 D126B320393; Sun, 2 Aug 2026 19:52:06 +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=1785700327; cv=none; b=VdeONTZcx7D0xgvMZ4Bfky6Z4H5K9Sv1zF+NBoM1UzvLI4zWiczakaH2VQ3RUCyl0RFmhsKz4v3QEoPG1Z1nkKZp5Jskvj6vI/Q6Pi4+uPh3cIr7VflQPwX1Jsl5B94YqPKeD9JicwIDzMfAmsHqJ8cos6lGIQhFFkvA2OmBiJ4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785700327; c=relaxed/simple; bh=jG4tqnmF+fhDnanNJAu01qZZRqA7JEfETRe29Ejqdck=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=kAs+amfKBSLWFTCRl1mq1wyoKwbiT2tXUsO89D4TYDtRy8nU5YqoQg1HcUTsZBRHHh0SYA1PjMHp8pH+B4NaP8ZRBhKz5F1sQHcKoZNjepJkCyyq9SFvtd4fsz7aOHbSlZs/XQHUTvzPXn5GHmu3vPB/amOvLaJHBxwx7Hvw3j4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Bukuf0lw; 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="Bukuf0lw" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2F80C1F000E9; Sun, 2 Aug 2026 19:52:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1785700326; bh=rqH4Xu/E74LiTszdv89UTWG+kpu8CAVJ+jzGMnMkj4U=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=Bukuf0lwPtf2Yto9s0JRutyGeam5kbdHsCg/npj/sLjuCSDsG03g16VAGPS88khqn P+lfQNz4U1gcGwU/uwPNttxizNVSWviEuuYQe4qXuL5fs7l5h6AKqZuSTcqfJG/OU/ UbVsL/3jAmAmDtPc5yAbze+TAnPVRtEb9En0jE7ZuFzLAVePr1V8RHapDCRjNLuGvT Impir9WTiM9+uwWnlZ9z2bZzq8QAfg1OyA17pRbBQ5r4xxc8za8QP8mIAjXil0jTmo ydH2p8/d47HWBr2BogGYOVHXptOU3ntuQr2jxLZEKbc8I6JT3lKxE6+xYDi6+F/DbM vj/kvnUv2kaVw== From: Yu Kuai To: Song Liu , Li Nan , Xiao Ni Cc: Yu Kuai , linux-raid@vger.kernel.org, linux-kernel@vger.kernel.org, Mykola Marzhan , Su Yue Subject: [PATCH v5 22/29] md/md-llbitmap: clamp state-machine walks to tracked bits Date: Mon, 3 Aug 2026 03:50:31 +0800 Message-ID: <20260802195038.164272-23-yukuai@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260802195038.164272-1-yukuai@kernel.org> References: <20260802195038.164272-1-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: 8bit 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. Tested-by: Mykola Marzhan 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 5d95627ff983..2830ce05d941 100644 --- a/drivers/md/md-llbitmap.c +++ b/drivers/md/md-llbitmap.c @@ -1012,7 +1012,10 @@ static enum llbitmap_state llbitmap_state_machine(struct llbitmap *llbitmap, llbitmap_init_state(llbitmap); return BitNone; } - + if (start >= llbitmap->chunks) + return BitNone; + if (end >= llbitmap->chunks) + end = llbitmap->chunks - 1; while (start <= end) { enum llbitmap_state c = llbitmap_read(llbitmap, start); -- 2.51.0