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| author | Elena Reshetova <elena.reshetova@intel.com> | 2017-03-03 10:55:12 +0200 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2017-04-18 14:07:23 +0200 |
| commit | 490b54d6fb75f6ffd0471ec58bb38a992e2b40cd (patch) | |
| tree | a7f431ea6a0f4369ba43be8736090efd54d6998b /fs/btrfs/volumes.c | |
| parent | 9b64f57ddf8673d29fafb3405d4aa1e93f5a4cd7 (diff) | |
| download | lwn-490b54d6fb75f6ffd0471ec58bb38a992e2b40cd.tar.gz lwn-490b54d6fb75f6ffd0471ec58bb38a992e2b40cd.zip | |
btrfs: convert extent_map.refs from atomic_t to refcount_t
refcount_t type and corresponding API should be
used instead of atomic_t when the variable is used as
a reference counter. This allows to avoid accidental
refcounter overflows that might lead to use-after-free
situations.
Signed-off-by: Elena Reshetova <elena.reshetova@intel.com>
Signed-off-by: Hans Liljestrand <ishkamiel@gmail.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: David Windsor <dwindsor@gmail.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/volumes.c')
| -rw-r--r-- | fs/btrfs/volumes.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 0f6706047167..dce59fb59b0c 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -4839,7 +4839,7 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans, ret = add_extent_mapping(em_tree, em, 0); if (!ret) { list_add_tail(&em->list, &trans->transaction->pending_chunks); - atomic_inc(&em->refs); + refcount_inc(&em->refs); } write_unlock(&em_tree->lock); if (ret) { |