From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 4E1DF1F9F73; Tue, 26 Aug 2025 12:51:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756212707; cv=none; b=OShs/k5pk/XTGb0TfYxmF9PcOkBGceX0nVcwbjP+xuSqU9w4dB2DbFFKRHT3T2ry2jxjznG2C9eagzLop0aKGWb6qhCjkutOJPFCCuptayrCeUhYh1wgq1TVVF8K/uMA2FOYH1w1swFK6dmmaP6styOtJIDxk4NVRc1LQHqYc34= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756212707; c=relaxed/simple; bh=m2Z8FQYI/AGx8yL9Mmkz5hq0qFLg1cJUDzFxnCCXB/Y=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=XNbvBIulAqx4KQ8HHQHFezVPE9cJ2t+2tLGl306XWBYtKreg25JTjFWeWc+pdJxL1s7XfHj14rri1MQrIGR9Ny26PIIxSzZirWGNbvzcnJ196J9m2jswvGy2hbo5nBTZRFFv0fVO82TuNk6bFu4GqAeCL3Pur9Ps7RDemF/MFbg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=k6ZOJOON; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="k6ZOJOON" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 79BB8C113CF; Tue, 26 Aug 2025 12:51:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1756212706; bh=m2Z8FQYI/AGx8yL9Mmkz5hq0qFLg1cJUDzFxnCCXB/Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=k6ZOJOON+GKmVexmCsek7lyzgkUVWd0GB4SA4U7/M/IEGG+jFdNqDgJa/5g8qXX4n y2Y41oACdkATXqnqnR8+LHrdOhOkqilM0VgiZGcnfdlemzj50PY+L3o6oR8wZEcSH+ K8j+Fl4+c8aNRhu30CzkUQhGxUts/+eSbKifI6fE= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, syzbot+478f2c1a6f0f447a46bb@syzkaller.appspotmail.com, Jan Kara , Sasha Levin Subject: [PATCH 6.6 072/587] udf: Verify partition map count Date: Tue, 26 Aug 2025 13:03:41 +0200 Message-ID: <20250826110954.765884916@linuxfoundation.org> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250826110952.942403671@linuxfoundation.org> References: <20250826110952.942403671@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jan Kara [ Upstream commit 1a11201668e8635602577dcf06f2e96c591d8819 ] Verify that number of partition maps isn't insanely high which can lead to large allocation in udf_sb_alloc_partition_maps(). All partition maps have to fit in the LVD which is in a single block. Reported-by: syzbot+478f2c1a6f0f447a46bb@syzkaller.appspotmail.com Signed-off-by: Jan Kara Signed-off-by: Sasha Levin --- fs/udf/super.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/fs/udf/super.c b/fs/udf/super.c index 20dff9ed2471..cb13a07a4aa8 100644 --- a/fs/udf/super.c +++ b/fs/udf/super.c @@ -1409,7 +1409,7 @@ static int udf_load_logicalvol(struct super_block *sb, sector_t block, struct genericPartitionMap *gpm; uint16_t ident; struct buffer_head *bh; - unsigned int table_len; + unsigned int table_len, part_map_count; int ret; bh = udf_read_tagged(sb, block, block, &ident); @@ -1430,7 +1430,16 @@ static int udf_load_logicalvol(struct super_block *sb, sector_t block, "logical volume"); if (ret) goto out_bh; - ret = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps)); + + part_map_count = le32_to_cpu(lvd->numPartitionMaps); + if (part_map_count > table_len / sizeof(struct genericPartitionMap1)) { + udf_err(sb, "error loading logical volume descriptor: " + "Too many partition maps (%u > %u)\n", part_map_count, + table_len / (unsigned)sizeof(struct genericPartitionMap1)); + ret = -EIO; + goto out_bh; + } + ret = udf_sb_alloc_partition_maps(sb, part_map_count); if (ret) goto out_bh; -- 2.39.5