From 3227788cd369d734d2d3cd94f8af7536b60fa552 Mon Sep 17 00:00:00 2001 From: BingJing Chang Date: Thu, 25 Mar 2021 09:56:22 +0800 Subject: [PATCH] btrfs: fix a potential hole punching failure In commit d77815461f04 ("btrfs: Avoid trucating page or punching hole in a already existed hole."), existing holes can be skipped by calling find_first_non_hole() to adjust start and len. However, if the given len is invalid and large, when an EXTENT_MAP_HOLE extent is found, len will not be set to zero because (em->start + em->len) is less than (start + len). Then the ret will be 1 but len will not be set to 0. The propagated non-zero ret will result in fallocate failure. In the while-loop of btrfs_replace_file_extents(), len is not updated every time before it calls find_first_non_hole(). That is, after btrfs_drop_extents() successfully drops the last non-hole file extent, it may fail with ENOSPC when attempting to drop a file extent item representing a hole. The problem can happen. After it calls find_first_non_hole(), the cur_offset will be adjusted to be larger than or equal to end. However, since the len is not set to zero, the break-loop condition (ret && !len) will not be met. After it leaves the while-loop, fallocate will return 1, which is an unexpected return value. We're not able to construct a reproducible way to let btrfs_drop_extents() fail with ENOSPC after it drops the last non-hole file extent but with remaining holes left. However, it's quite easy to fix. We just need to update and check the len every time before we call find_first_non_hole(). To make the while loop more readable, we also pull the variable updates to the bottom of loop like this: while (cur_offset < end) { ... // update cur_offset & len // advance cur_offset & len in hole-punching case if needed } Reported-by: Robbie Ko Fixes: d77815461f04 ("btrfs: Avoid trucating page or punching hole in a already existed hole.") CC: stable@vger.kernel.org # 4.4+ Reviewed-by: Robbie Ko Reviewed-by: Chung-Chiang Cheng Reviewed-by: Filipe Manana Signed-off-by: BingJing Chang Signed-off-by: David Sterba --- fs/btrfs/file.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index 4263465..864c08d 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -2730,8 +2730,6 @@ int btrfs_replace_file_extents(struct btrfs_inode *inode, extent_info->file_offset += replace_len; } - cur_offset = drop_args.drop_end; - ret = btrfs_update_inode(trans, root, inode); if (ret) break; @@ -2751,7 +2749,9 @@ int btrfs_replace_file_extents(struct btrfs_inode *inode, BUG_ON(ret); /* shouldn't happen */ trans->block_rsv = rsv; - if (!extent_info) { + cur_offset = drop_args.drop_end; + len = end - cur_offset; + if (!extent_info && len) { ret = find_first_non_hole(inode, &cur_offset, &len); if (unlikely(ret < 0)) break; -- 2.7.4