From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f71.google.com (mail-ot1-f71.google.com [209.85.210.71]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2B39E2E229F for ; Sun, 9 Aug 2026 02:27:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.71 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786242445; cv=none; b=FsxEViRdGAjc9BdamaVa7QPFxGy1Nwm/nnnnp3+89+YjCldz3HE+Hyy9ceVCiAVRNOVmXvCqe80eHiV5idlWingPzaubvUyzR5qEpmxxBkj2o12JQ3M5uoFFOj30Npy7iDteEp2GUrRCpPxZ/DnjemUOyPwBrjb9RkDl7waQuPc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786242445; c=relaxed/simple; bh=v++Y5pvassra/I7ii47ltQVV4MUfw33NfvDRT0thinE=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=e9tRNsmDImxgf+42bi+9XGqE7j39DgpkKrcOAv/WnwSf4Lr0JPCdephSR1vO6RialBA7jo0ow4omCHgcZ7KH7pEgBkv8M6sifr0PAu+NFeP3XggZk9Gcj60QmY8H1/TfSgxCLuvUJ+DEfoU0OCxYwKk2yW9u+G7NrLgg9Xay4O8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.210.71 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-ot1-f71.google.com with SMTP id 46e09a7af769-7f18aff8226so899036a34.2 for ; Sat, 08 Aug 2026 19:27:23 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1786242443; x=1786847243; h=content-type:to:from:subject:message-id:in-reply-to:date :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to:content-type; bh=h67p/zMfBegvVJtNu3hM4AGh97agCrB9T6EbjrHyE70=; b=JwnuII7HDwOVXQCW068WSwFeF7PO6ApAdhc2mCU4KwC4wz2X2kYGDD5lijI53Gt7+9 OsCkEm1w904RLvL7rv+F05RoU0D+clszmfVP28x2UN4F0lzEMhote7EGIwr3VwNLqJi5 +VRoSTsrpMbwrdI3pKDGgSfPbHZyu220MH18ILbcOLNp6bpzH/nD5ndThYfAmm4o+oks 2rErZG+fuiGPNWt9jzf8VZcYu83DIbT3embyN2hZPnqLGEvYDEWuMKVJtoQPe8g9hAE3 kD0KfS9+J5iHlVyaxloVlqfra2RfbjOqWrPFgHs1u9S90ia6NCp55K+zS9AXDqSXBj6d h9XA== X-Gm-Message-State: AOJu0YxPXN0aVpwbPO9oNqWU21UDH/NdAmMUeCHUKDz0ogjw94VK9GDt E3hDANKfOC4ozgbuuUZk7kK+Xg7rvyJPReTIsmqNfEqXG0E7osLVKqtpdgoLhktah9TNfZiY0hR J2Y10qMr3PTtoyNnipB5I07TrOEdnPqUUwCZHtTqX7lAVaKGvPke/Gr5l78g= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:1c9a:b0:6ae:93af:cb97 with SMTP id 006d021491bc7-6ae96935e91mr16021080eaf.0.1786242443228; Sat, 08 Aug 2026 19:27:23 -0700 (PDT) Date: Sat, 08 Aug 2026 19:27:23 -0700 In-Reply-To: <6a778c82.01d0871a.3a0d52.006a.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a77e58b.01d0871a.3a0d52.007d.GAE@google.com> Subject: Forwarded: [PATCH] md: enforce minimum of 2 disks for raid 4 and 5 From: syzbot To: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" For archival purposes, forwarding an incoming command email to linux-kernel@vger.kernel.org. *** Subject: [PATCH] md: enforce minimum of 2 disks for raid 4 and 5 Author: ryan.mehri1@gmail.com #syz test Signed-off-by: Ryan Mehri --- drivers/md/raid5.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index ffb5fcde54a9..e02c579d4ceb 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -7541,6 +7541,12 @@ static struct r5conf *setup_conf(struct mddev *mddev) mdname(mddev), mddev->new_layout); return ERR_PTR(-EIO); } + if ((mddev->new_level == 4 || mddev->new_level == 5) + && mddev->raid_disks < 2) { + pr_warn("md/raid:%s: not enough configured devices (%d, minimum 2)\n", + mdname(mddev), mddev->raid_disks); + return ERR_PTR(-EINVAL); + } if (mddev->new_level == 6 && mddev->raid_disks < 4) { pr_warn("md/raid:%s: not enough configured devices (%d, minimum 4)\n", mdname(mddev), mddev->raid_disks); -- 2.55.0