From: Christoph Hellwig <hch@xxxxxx>
commit 12b2d64e591652a2d97dd3afa2b062ca7a4ba352 upstream.
When the call to btrfs_reloc_clone_csums in cow_file_range returns an
error, we jump to the out_unlock label with the extent_reserved variable
set to false. The cleanup at the label will then call
extent_clear_unlock_delalloc on the range from start to end. But we've
already added cur_alloc_size to start before the jump, so there might no
range be left from the newly incremented start to end. Move the check for
'start < end' so that it is reached by also for the !extent_reserved case.
CC: stable@xxxxxxxxxxxxxxx # 6.1+
Fixes: a315e68f6e8b ("Btrfs: fix invalid attempt to free reserved space on failure to cow range")
Reviewed-by: Josef Bacik <josef@xxxxxxxxxxxxxx>
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/btrfs/inode.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -1453,8 +1453,6 @@ out_unlock:
clear_bits,
page_ops);
start += cur_alloc_size;
- if (start >= end)
- return ret;
}
/*
@@ -1463,9 +1461,11 @@ out_unlock:
* space_info's bytes_may_use counter, reserved in
* btrfs_check_data_free_space().
*/
- extent_clear_unlock_delalloc(inode, start, end, locked_page,
- clear_bits | EXTENT_CLEAR_DATA_RESV,
- page_ops);
+ if (start < end) {
+ clear_bits |= EXTENT_CLEAR_DATA_RESV;
+ extent_clear_unlock_delalloc(inode, start, end, locked_page,
+ clear_bits, page_ops);
+ }
return ret;
}
