From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from va-2-29.ptr.blmpb.com (va-2-29.ptr.blmpb.com [209.127.231.29]) (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 D4BAC437875 for ; Tue, 11 Aug 2026 10:15:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.127.231.29 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786443316; cv=none; b=ieQ3tZSqecQE90rOJPKmaT0eY1xiDSt/xn/VkSBNGQGeKpwpmIPXcYYoLdRYjdB66tDK6imVdlC0bQ61cJvwndXlpj8qUWbCFThRQ5aXjQAvpmI/0N6EbYZvohXFY68PcRJ0kfdAcHb8OwxF/hZdif8+m/NV7mmWyMXDcEOSYHo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786443316; c=relaxed/simple; bh=nNqJnw6dWfsKqDN6/zIT6tMxp/FUFPB5sRUAPveOxWI=; h=To:Mime-Version:Content-Type:Subject:Date:Message-Id:Cc:From; b=b0mMHOXKC0bjAy9haSzrRv7e0UWn+z97U1Qe9OvhZMuAffnCPx8ZKRDa3wbMEN5HmPVFEE3vdv8KZVrnPxCGTYQi5zxl++e/YvT2cnthCCY/GYicgcrdsu23pAwg8bR/9kdkNc87q4w+QMrJnVlPl55ZGoeA3g62ECC6fyBBDqs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=fnnas.com; spf=pass smtp.mailfrom=fnnas.com; dkim=pass (2048-bit key) header.d=fnnas-com.20200927.dkim.feishu.cn header.i=@fnnas-com.20200927.dkim.feishu.cn header.b=vy5kQct3; arc=none smtp.client-ip=209.127.231.29 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=fnnas.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=fnnas.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=fnnas-com.20200927.dkim.feishu.cn header.i=@fnnas-com.20200927.dkim.feishu.cn header.b="vy5kQct3" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; s=s1; d=fnnas-com.20200927.dkim.feishu.cn; t=1786443298; h=from:subject:mime-version:from:date:message-id:subject:to:cc: reply-to:content-type:mime-version:in-reply-to:message-id; bh=or7qsoTRDcUrSqtp0cahORvlTJsncX2WyWBQes98vQE=; b=vy5kQct3j4p/4JYxgwx7soJLQZHftWB4wigV2AyorP5YfX3iYE4xfbxGZqUiDHe00Jg59d inr+PjtihK3Yej3o4KF5LsmencPyChWn2XPSQVELvbVRwhQKibdpm9Saq9yw9JxrUYeVt6 7pGtQ0bUCI1J3V9JbuJNthSM2Me8vj7eT8+56Xvkx0du+347cdJ5Ss/NsEFQ/qeGAWsoEB zrm8+6hDAUa1dGHRy5VjWwrWoGF3yBXOa4x+hOh6PtjuA/1YiLDC4Gi1g6szYIqjaqFr0y f7BpGRzCu2KwpBMs796WQ2fExtSn37EtFJJn6Tp3DsRjqCy6U6Diy4Rl9S4N6A== To: , X-Lms-Return-Path: X-Mailer: git-send-email 2.55.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Received: from fedora ([183.34.168.106]) by smtp.feishu.cn with ESMTPS; Tue, 11 Aug 2026 18:14:56 +0800 X-Original-From: chencheng@fnnas.com Content-Type: text/plain; charset=UTF-8 Subject: [PATCH] md/raid5: fail invalid raid5_set_limits() geometry Date: Tue, 11 Aug 2026 18:14:36 +0800 Message-Id: <20260811101436.458181-1-chencheng@fnnas.com> Content-Transfer-Encoding: 7bit Cc: , , From: "Chen Cheng" From: Chen Cheng Prevent raid5_set_limits() from building a stripe size when the array geometry reports no data disks. Reported-by: syzbot+de94ddbfff0c9e6fe030@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=de94ddbfff0c9e6fe030 Fixes: f63f17350e537300312 ("md/raid5: use the atomic queue limit update APIs") Signed-off-by: Chen Cheng --- drivers/md/raid5.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index ffb5fcde54a9..c0adb73b1dd4 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -7825,10 +7825,12 @@ static int raid5_set_limits(struct mddev *mddev) /* * The read-ahead size must cover two whole stripes, which is * 2 * (datadisks) * chunksize where 'n' is the number of raid devices. */ data_disks = conf->previous_raid_disks - conf->max_degraded; + if (data_disks <= 0) + return -EINVAL; /* * We can only discard a whole stripe. It doesn't make sense to * discard data disk but write parity disk */ -- 2.55.0