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Wed, 22 Jul 2026 01:24:28 -0700 (PDT) From: Zhan Xusheng X-Google-Original-From: Zhan Xusheng To: Jan Kara Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Zhan Xusheng Subject: [PATCH] udf: Fix i_lenExtents truncation on 32-bit kernels Date: Wed, 22 Jul 2026 16:24:25 +0800 Message-ID: <20260722082425.213311-1-zhanxusheng@xiaomi.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" In udf_do_extend_file() the total extent length is rounded up to a block boundary with: iinfo->i_lenExtents =3D (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 --- fs/udf/inode.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/udf/inode.c b/fs/udf/inode.c index 67bcf83758c8..c519644acfd7 100644 --- a/fs/udf/inode.c +++ b/fs/udf/inode.c @@ -531,7 +531,7 @@ static int udf_do_extend_file(struct inode *inode, sb->s_blocksize - 1) & ~(sb->s_blocksize - 1)); iinfo->i_lenExtents =3D (iinfo->i_lenExtents + sb->s_blocksize - 1) & - ~(sb->s_blocksize - 1); + ~((u64)sb->s_blocksize - 1); } =20 add =3D 0; --=20 2.43.0