diff options
| author | Filipe Manana <fdmanana@suse.com> | 2020-05-27 11:15:53 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-06-22 09:05:26 +0200 |
| commit | 789555b22ba2e62fd197a17be075ec8314d0c0b2 (patch) | |
| tree | baa28481c20dcc283e941c7bdec9aee0dc7bdbb8 /security | |
| parent | 74bee8344b7defb5dd41de37290df51bc9e12f5e (diff) | |
btrfs: fix wrong file range cleanup after an error filling dealloc range
[ Upstream commit e2c8e92d1140754073ad3799eb6620c76bab2078 ]
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 <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'security')
0 files changed, 0 insertions, 0 deletions