From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 E53BB422556; Fri, 4 Sep 2026 06:23:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788503000; cv=none; b=aP4kNemzBFlb7RHjISb0IJWRnnRSeqiwwk7eMqpi8kSsgttu/6xTiFsS0wjgBPNrwtJkdnOXiYGAwyrVZ4krYH07BGr9X1mtI5sAC9VH9bMZvUkqzDSSEvB6xKpBXQ8SMB7kXdgs/7Uljm9vUIwq0yFnBY2pUs8rJ5OHYbfwoCw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788503000; c=relaxed/simple; bh=eymuiFrGEcZcW3bxoEDOAbZMWEpzo8ZTJY+3HKk5bAs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=XQZiZZ23lx976MpFnXgw5x3oM0PteMRAEzXftZXlP3utyzcbL5e/pWvq+2+YgjpD2V1PUYk2jMoe5Lwjf/gUHeKarBZ8BK0IIMK2rDn6czCHXsYs8RP/nwqz1UB9LB+U24owKKIhXbGN8GgbAk+W+DQNrMnKx1dUlSp8DaJZHL0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=i0yvo9Et; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="i0yvo9Et" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4A2231F00A3E; Fri, 4 Sep 2026 06:23:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1788502998; bh=+/FyqgDdnYHmGpilXejjvc3iq46ZcKBurgAvAf3F4VI=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=i0yvo9EtGvA4ASGzJM8l+DFJ+RXMbMZGil2GuAsW4ZNRN2JpCGQinjXQ0T5NPqocf 11zqw9F8Z+3+OUBLo7o12l8UtYbVWTE3lP47GG5ACib/1zwFXDdgjyXBTmVSNReDMj Bco3+7ytjSP6WlgtDRsu8Fizto13sY2ADYoUUQic= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Zhan Xusheng , Jan Kara Subject: [PATCH 6.12 402/403] udf: Fix i_lenExtents truncation on 32-bit kernels Date: Fri, 4 Sep 2026 07:03:25 +0200 Message-ID: <20260904045743.920401942@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260904045734.806166532@linuxfoundation.org> References: <20260904045734.806166532@linuxfoundation.org> User-Agent: quilt/0.69 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 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Zhan Xusheng commit a5a5ed23b1340ff0f32a14a7ca8585f7c4e9b2e2 upstream. In udf_do_extend_file() the total extent length is rounded up to a block boundary with: iinfo->i_lenExtents = (iinfo->i_lenExtents + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1); i_lenExtents is a __u64, but sb->s_blocksize is unsigned long. On 32-bit kernels unsigned long is 32-bit, so ~(sb->s_blocksize - 1) is a 32-bit value (e.g. 0xfffff800 for a 2 KiB block) that is zero-extended in the AND, clearing the upper 32 bits of i_lenExtents. For UDF files whose total extent length exceeds 4 GiB this truncates i_lenExtents when the file is extended, corrupting the tracked extent length. Cast the block size to 64-bit before forming the mask. 64-bit kernels are unaffected. Fixes: 48d6d8ff7dca ("udf: cache struct udf_inode_info") Cc: stable@vger.kernel.org Signed-off-by: Zhan Xusheng Link: https://patch.msgid.link/20260722082425.213311-1-zhanxusheng@xiaomi.com Signed-off-by: Jan Kara Signed-off-by: Greg Kroah-Hartman --- fs/udf/inode.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/fs/udf/inode.c +++ b/fs/udf/inode.c @@ -525,7 +525,7 @@ static int udf_do_extend_file(struct ino sb->s_blocksize - 1) & ~(sb->s_blocksize - 1)); iinfo->i_lenExtents = (iinfo->i_lenExtents + sb->s_blocksize - 1) & - ~(sb->s_blocksize - 1); + ~((u64)sb->s_blocksize - 1); } add = 0;