From nobody Tue Sep 29 13:20:39 2026 Received: from m16.mail.126.com (m16.mail.126.com [220.197.31.9]) (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 0513C476CC1 for ; Fri, 7 Aug 2026 16:05:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=220.197.31.9 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786118766; cv=none; b=BVFOeBfjwqQwrEMGtDbBW6f76mGOnTcFoyLB/gfN2QtyUzlTepCv+ENyI4QADMLLr6b2YTs/VEmm/VrsEDdFjiiIZrUk/tXrLZ3QbYc6gSU9hgu9HXrpXmyfN66TpI5WmOnHVChdWK4gvfX88NSCNdr2+2kEVIuqAnePAjflXjU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786118766; c=relaxed/simple; bh=HXwFKoMvjs0TmlmvBSlL34L+QPx5rBHifQmWXRokN0E=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=DS0EUJKwWBw2wc8fU+c0H7ejAOuWul5jP5EOBXNAV8xiNVfCDRwSkXK3Zs5WVnFStL4B6oKvpVcIXuv2SMl46snJFIGAA63XnqqFp2hrqDGGVXQyzqvRo6O/cagBBcc/VQTYkFmd9NIfPFNDnhnEDASTjQz5Z7hLqUA3lND48ZA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=126.com; spf=pass smtp.mailfrom=126.com; dkim=pass (1024-bit key) header.d=126.com header.i=@126.com header.b=lM8PBXgN; arc=none smtp.client-ip=220.197.31.9 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=126.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=126.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=126.com header.i=@126.com header.b="lM8PBXgN" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=126.com; s=s110527; h=From:To:Subject:Date:Message-ID:MIME-Version; bh=qB /T9uO/CEivuY5YxwMqjdDII0Q/62wuGCjSQBKNUn8=; b=lM8PBXgNyVoumKcaq+ 0gQETxchDm0IfWhz1GN8+hbJVOPY9KcBprKVAkV1Tyx46CWcuX3Bhthzz8j5pOWc Zhp++bE4hFZJ8/f72pIxLXCQjizfFuOXOdwBFNxb61Wv07oKPbIJvbWsTVVrIyi1 h4FUtthjVJs9+p+Cscbztkk+w= Received: from LAPTOP-N9A9U1FG.localdomain (unknown []) by gzsmtp3 (Coremail) with SMTP id PikvCgDn15teAHZqLn67Eg--.20550S4; Fri, 07 Aug 2026 23:57:50 +0800 (CST) From: Genjian To: agk@redhat.com, snitzer@kernel.org, mpatocka@redhat.com, bmarzins@redhat.com Cc: rdunlap@infradead.org, DamienLeMoal@wdc.com, zhengbin13@huawei.com, heinzm@redhat.com, dm-devel@lists.linux.dev, linux-kernel@vger.kernel.org, zhanggenjian@126.com, Genjian Zhang Subject: [PATCH] dm-ebs: fix incorrect device offset check in ebs_ctr() Date: Fri, 7 Aug 2026 23:57:15 +0800 Message-ID: <20260807155715.465254-1-zhanggenjian@126.com> X-Mailer: git-send-email 2.43.0 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 X-CM-TRANSID: PikvCgDn15teAHZqLn67Eg--.20550S4 X-Coremail-Antispam: 1Uf129KBjvdXoW7XFW7JFWUtryrGryfWw4rXwb_yoWkCFb_Cw 1rXFyqgr4UWr1F9Fy5Cw4rZrZ2yrs5ur47Z3WftFsavFyxWryDZF1kW3ZYyF1fur4fArZ0 yas8G3yfGr17WjkaLaAFLSUrUUUUjb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUvcSsGvfC2KfnxnUUI43ZEXa7xRZAwIDUUUUU== X-CM-SenderInfo: x2kd0wxjhqyxldq6ij2wof0z/xtbBtR5X1Wp2AH6bVgAA3G Content-Type: text/plain; charset="utf-8" From: Genjian Zhang is a backing-device sector offset; ti->len is the virtual target length. Comparing them rejects valid tables, e.g.: dmsetup create ebs0 --table "0 1048576 ebs /dev/sda 2097152 1 8" -> ebs: Invalid device offset sector (-EINVAL) Drop the check. Bounds against the backing device are already enforced later by device_area_is_invalid() via ebs_iterate_devices(). Fixes: d3c7b35c20d6 ("dm: add emulated block size target") Signed-off-by: Genjian Zhang --- drivers/md/dm-ebs-target.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/md/dm-ebs-target.c b/drivers/md/dm-ebs-target.c index 1e52bde48b91..5d67c6c19d4b 100644 --- a/drivers/md/dm-ebs-target.c +++ b/drivers/md/dm-ebs-target.c @@ -265,8 +265,7 @@ static int ebs_ctr(struct dm_target *ti, unsigned int a= rgc, char **argv) =20 r =3D -EINVAL; if (sscanf(argv[1], "%llu%c", &tmp, &dummy) !=3D 1 || - tmp !=3D (sector_t)tmp || - (sector_t)tmp >=3D ti->len) { + tmp !=3D (sector_t)tmp) { ti->error =3D "Invalid device offset sector"; goto bad; } --=20 2.43.0