From: Filipe Manana Date: Wed, 27 May 2020 10:15:53 +0000 (+0100) Subject: btrfs: fix wrong file range cleanup after an error filling dealloc range X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=e2c8e92d1140754073ad3799eb6620c76bab2078;p=linux.git btrfs: fix wrong file range cleanup after an error filling dealloc range If an error happens while running dellaloc in COW mode for a range, we can end up calling extent_clear_unlock_delalloc() for a range that goes beyond our range's end offset by 1 byte, which affects 1 extra page. This results in clearing bits and doing page operations (such as a page unlock) outside our target range. Fix that by calling extent_clear_unlock_delalloc() with an inclusive end offset, instead of an exclusive end offset, at cow_file_range(). Fixes: a315e68f6e8b30 ("Btrfs: fix invalid attempt to free reserved space on failure to cow range") CC: stable@vger.kernel.org # 4.14+ Signed-off-by: Filipe Manana Signed-off-by: David Sterba --- diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 4583f07635716..1b6cd937f214f 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -1141,7 +1141,7 @@ out_unlock: */ if (extent_reserved) { extent_clear_unlock_delalloc(inode, start, - start + cur_alloc_size, + start + cur_alloc_size - 1, locked_page, clear_bits, page_ops);