From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pz2-f39.google.com (mail-pz2-f39.google.com [74.125.228.39]) (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 7614F28030E for ; Wed, 30 Sep 2026 08:19:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.228.39 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790756399; cv=none; b=rhhKg2iZjROrr4/ug4rcL767fOQq9km7KMVlz7qz227gi7U5WoyLfSx6oNpEeR+SEQHvrvxZVZJbrZ5zB+9AxXajYaVwmOoDgc2+6No84ZqEd1zv6gE+zkskZEfZz69kKZj/+mecgQKuhZRj20B3FMOhrVX2S8NUleHQx1Toxr8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790756399; c=relaxed/simple; bh=0gjYmHMsYtGt0dv2202GWXaLoFT5O5HyNSJCI48LApw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=eYtvAa+NTBNvP3lFd5cBS8ZV5Cr0iaVvJT4W4wW231Dphz3w2IhyPbu7iIsZfT3qaHCjVwe3yfe+DQ7FCCKEyinOIoCJJLht6rl0mlbOtFAFFjkiptGd3QTIYSBynKU6mvZh0MZdBbiUHTSsCDDW34h4kKtNlCb/4C5rWBE0vK0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=B+zQms9J; arc=none smtp.client-ip=74.125.228.39 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="B+zQms9J" Received: by mail-pz2-f39.google.com with SMTP id 41be03b00d2f7-cc79a5bdf9fso851714a12.1 for ; Wed, 30 Sep 2026 01:19:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1790756394; x=1791361194; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to:content-type; bh=sMOZacyHUhLKKfjPN/Y3wFIc5irsTWPuma4tJ7myNr0=; b=B+zQms9JcOon40b7c3FoLN9wViSyF6APitveYbGgL1zjcJwNFvL8/5anF68+RZ7H0/ IkcJ49gVtYy0137XdF0spYKRWgJOds9ov9Jg90/oOu7n+Kl2DtZC2ZTOO1LXFOVmryYy tlgl+wEwkNvXWUKmcEYrvVlXvTy1cEZgG0+j8mWJQBtmkzbWDp0WAT9d3A+O1nNMkqvJ aAuFr+4ZL70za1z7EXq7zFihUTdQfILyvdkDO5WFQRAOkTXAhETHnGE5ZfFN6k1bqbhe g2F+1VY5ZuSUYSwtC8gk++qIA52zgW54551I4j6YbgZ3VHhy3z5NLNRcJj5hXHM1Wx7r eWNQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1790756394; x=1791361194; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to:content-type; bh=sMOZacyHUhLKKfjPN/Y3wFIc5irsTWPuma4tJ7myNr0=; b=da5v0jJq3XqbDKwMXJB+lI569VTIunEllT7JNZfX0Y+nnIh/MQCADMQhYhIv2qAq1h fLWXGM19d3NcpxftWOLRmykS7eeJvqphmwtMGbExA2Ew90Ksy5Pbq2GDxbT87JZZh1lY rwvGfoeC9VQCsle6CZiFLNgOEcC9UHuVqE0t11ND7zPfuDtzjnL1dFOjeoFMjmAhqR8z DLlXmMGFA43nAR91GsZULQ7Rg325ULyZP6fN2LHZe0/oN8zdcTKcnaEzwWPCPF22Nhb/ gD2iSB5r0ybzxQEMozBrtgAPTN0DK73CQbEPddA19Ga8a0Gq19uVTNF0JurZxTAbzKu1 2Dng== X-Forwarded-Encrypted: i=1; AKwUvBwrqGKRCayuPRxRegLZKEtYOLdzlFZoKYSgSkuEQFkjJ2mRuqCLiSknr5Jbsl6fCaB0xYNtACxrktTicQs=@vger.kernel.org X-Gm-Message-State: AFuF++mokF6pskV4o8dYH3OdJS4VnR6Sm1AQojrnd6tvxGUWKx7hAikE x5+Q6QfmGxrrDnGDoAXJwdOzW8ah7m/Efsq9QyKq0iB3BNhXeB/aAO4/ X-Gm-Gg: AYBFou2orwB9b/798W3FoJv9txC/xhNfHL3AEVyGTb1VLp1Q9U71W+7u4kZsIQCaugJ YD74BowCbDm7rKWQulIyFQdgbXsgtm2cjIlXcuL1lk/xtaVyGe9MgnaPwqz74atzgajiTZmlJlA 4fqJF3dMbmxDUIZv5kcs4fwr4C/X5GUdCm4G7f1aHqLlML9W3wpNUrW3oRXSQwf0e/LnLMLdsmq BQhKf8nXL3kVJ/FMpEYu5dVMz1LlgVCqmmYhwvApU7f9UGp/0bsmyq6WUOjrjso0PpIqkcpS/E0 S5B3fPAbDVVzrFJjjUQiMHFPji0UMeTKlSHx3wOY42zGzk8p8LSSVwdpstX951d1sK3jtcPiqba oFNu/36HgDjDKta2L9k8MCo3h7n6AHmGk/lJ3Q6KN/CcEWnNfm/Nkx24Z2ssHkv0+J5xu+J7KsJ xssQV041POl0nt4cEX9GpniO+gJaj+RCpHjr6oYHEY8BWZBRjuFEARyP2nGfdAh5CmOYeP2H64w PN+/q7rWmx7ZF/sGpxvNfG9DZMnCty1r2XBG846bkgPHakPhMlgA77d8GGkDgM4EIMFZ87YLiEt J6LL13gH0w== X-Received: by 2002:a05:6300:48:b0:3de:141e:c712 with SMTP id adf61e73a8af0-3de9ef62c1emr441453637.14.1790756393656; Wed, 30 Sep 2026 01:19:53 -0700 (PDT) Received: from phui-2.c.googlers.com.com (25.187.82.34.bc.googleusercontent.com. [34.82.187.25]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-cc7da126a49sm453319a12.7.2026.09.30.01.19.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 30 Sep 2026 01:19:53 -0700 (PDT) From: Hui Peng To: Anders Larsen , Matthias Goergens Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, Hui Peng Subject: [PATCH v5 6/6] qnx6: validate sb_blocksize before dividing in qnx6_mmi_fill_super() Date: Wed, 30 Sep 2026 08:19:47 +0000 Message-ID: <20260930081947.511613-7-benquike@gmail.com> X-Mailer: git-send-email 2.56.0.rc1.315.gc6ed9934b7-goog In-Reply-To: <20260930081947.511613-1-benquike@gmail.com> References: <20260930081947.511613-1-benquike@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit In qnx6_mmi_fill_super(), sb1->sb_blocksize is loaded directly from disk without checking for zero before calculating: QNX6_BOOTBLOCK_SIZE / fs32_to_cpu(sbi, sb1->sb_blocksize) If sb_blocksize is zero on a corrupted MMI filesystem image, this division causes a divide-by-zero error in kernel space. Validate sb1->sb_blocksize before dividing in qnx6_mmi_fill_super(). Fixes: 3377755f1064 ("qnx6: add support for MMI (MME) media filesystem variant") Cc: stable@vger.kernel.org Tested-by: Matthias Goergens Assisted-by: LLM Signed-off-by: Hui Peng --- fs/qnx6/super_mmi.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/qnx6/super_mmi.c b/fs/qnx6/super_mmi.c index 2b6183d2c889..fe84a9e2012d 100644 --- a/fs/qnx6/super_mmi.c +++ b/fs/qnx6/super_mmi.c @@ -48,6 +48,8 @@ struct qnx6_super_block *qnx6_mmi_fill_super(struct super_block *s, int silent) sb1 = (struct qnx6_super_block *)bh1->b_data; /* calculate second superblock blocknumber */ + if (!fs32_to_cpu(sbi, sb1->sb_blocksize)) + goto out1; offset = fs32_to_cpu(sbi, sb1->sb_num_blocks) + (QNX6_BOOTBLOCK_SIZE / fs32_to_cpu(sbi, sb1->sb_blocksize)); -- 2.47.3