diff options
| author | Jan Kara <jack@suse.cz> | 2022-12-16 12:37:51 +0100 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2023-01-09 10:39:52 +0100 |
| commit | 53cafe1d6d8ef9f93318e5bfccc0d24f27d41ced (patch) | |
| tree | 6a50cba132ec396235b18d06ea5eb55ff331324c /fs | |
| parent | 70bfb3a8d661d4fdc742afc061b88a7f3fc9f500 (diff) | |
udf: Do not bother merging very long extents
When merging very long extents we try to push as much length as possible
to the first extent. However this is unnecessarily complicated and not
really worth the trouble. Furthermore there was a bug in the logic
resulting in corrupting extents in the file as syzbot reproducer shows.
So just don't bother with the merging of extents that are too long
together.
CC: stable@vger.kernel.org
Reported-by: syzbot+60f291a24acecb3c2bd5@syzkaller.appspotmail.com
Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/udf/inode.c | 19 |
1 files changed, 2 insertions, 17 deletions
diff --git a/fs/udf/inode.c b/fs/udf/inode.c index e077183e2ee3..5498365669eb 100644 --- a/fs/udf/inode.c +++ b/fs/udf/inode.c @@ -997,23 +997,8 @@ static void udf_merge_extents(struct inode *inode, struct kernel_long_ad *laarr, blocksize - 1) >> blocksize_bits)))) { if (((li->extLength & UDF_EXTENT_LENGTH_MASK) + - (lip1->extLength & UDF_EXTENT_LENGTH_MASK) + - blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) { - lip1->extLength = (lip1->extLength - - (li->extLength & - UDF_EXTENT_LENGTH_MASK) + - UDF_EXTENT_LENGTH_MASK) & - ~(blocksize - 1); - li->extLength = (li->extLength & - UDF_EXTENT_FLAG_MASK) + - (UDF_EXTENT_LENGTH_MASK + 1) - - blocksize; - lip1->extLocation.logicalBlockNum = - li->extLocation.logicalBlockNum + - ((li->extLength & - UDF_EXTENT_LENGTH_MASK) >> - blocksize_bits); - } else { + (lip1->extLength & UDF_EXTENT_LENGTH_MASK) + + blocksize - 1) <= UDF_EXTENT_LENGTH_MASK) { li->extLength = lip1->extLength + (((li->extLength & UDF_EXTENT_LENGTH_MASK) + |