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| author | Zhan Xusheng <zhanxusheng1024@gmail.com> | 2026-07-22 16:24:25 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2026-09-07 17:18:25 +0200 |
| commit | 77ca2edeabb351f6cc4d9e5c3a3d7a95bac30d4d (patch) | |
| tree | 0a14082d906aa1c708cb7774da19b7220816fcbc | |
| parent | f1a2f57598b5cc5f1d069ec17c9dfa8dce74101a (diff) | |
| download | linux-stable-77ca2edeabb351f6cc4d9e5c3a3d7a95bac30d4d.tar.gz linux-stable-77ca2edeabb351f6cc4d9e5c3a3d7a95bac30d4d.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 0f97850a165a..2513816c48f5 100644 --- a/fs/udf/inode.c +++ b/fs/udf/inode.c @@ -525,7 +525,7 @@ 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; |