diff options
| author | Zhan Xusheng <zhanxusheng1024@gmail.com> | 2026-07-22 16:24:25 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2026-09-07 17:23:00 +0200 |
| commit | 2d6150e5e6aa641e02e0072ac937b09bdc1e73f8 (patch) | |
| tree | be3c510d1b51f1e1a3076d4c214f624fd729c01b | |
| parent | b7eff3f621ef24624f946e35fe7deb6a36398576 (diff) | |
| download | linux-stable-2d6150e5e6aa641e02e0072ac937b09bdc1e73f8.tar.gz linux-stable-2d6150e5e6aa641e02e0072ac937b09bdc1e73f8.zip | |
udf: Fix i_lenExtents truncation on 32-bit kernels
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 <zhanxusheng@xiaomi.com>
Link: https://patch.msgid.link/20260722082425.213311-1-zhanxusheng@xiaomi.com
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | fs/udf/inode.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/udf/inode.c b/fs/udf/inode.c index a79d73f28aa7..3a184ded12ad 100644 --- a/fs/udf/inode.c +++ b/fs/udf/inode.c @@ -532,7 +532,7 @@ static int udf_do_extend_file(struct inode *inode, 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; |