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btrfs: fix the length of reserved qgroup to free 

Fix CVE: CVE-2024-46733

Already merged into maintainer's for-next, not yet released in upstream.

The dealloc flag may be cleared and the extent won't reach the disk in
cow_file_range when errors path. The reserved qgroup space is freed in
commit 30479f31d44d ("btrfs: fix qgroup reserve leaks in
cow_file_range"). However, the length of untouched region to free needs
to be adjusted with the correct remaining region size.

Fixes: 30479f31d44d ("btrfs: fix qgroup reserve leaks in cow_file_range")
Reviewed-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Boris Burkov <boris@bur.io>
Signed-off-by: Haisu Wang <haisuwang@tencent.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Haisu Wang 2024-10-25 14:54:40 +08:00
parent 341caf7c0d
commit fbe514ebb5
1 changed files with 1 additions and 1 deletions
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2
fs/btrfs/inode.c
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@ -1560,7 +1560,7 @@ out_unlock:
clear_bits |= EXTENT_CLEAR_DATA_RESV;
extent_clear_unlock_delalloc(inode, start, end, locked_page,
clear_bits, page_ops);
btrfs_qgroup_free_data(inode, NULL, start, cur_alloc_size, NULL);
btrfs_qgroup_free_data(inode, NULL, start, end - start + 1, NULL);
}
return ret;
}