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| author | Elena Reshetova <elena.reshetova@intel.com> | 2017-03-03 10:55:11 +0200 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2017-04-18 14:07:23 +0200 |
| commit | 9b64f57ddf8673d29fafb3405d4aa1e93f5a4cd7 (patch) | |
| tree | d2a39847438cd265d8c0dbc3c61550980753e59a /fs/btrfs/extent-tree.c | |
| parent | 140475ae4ad10d140bb69572499b1ff87367e807 (diff) | |
| download | lwn-9b64f57ddf8673d29fafb3405d4aa1e93f5a4cd7.tar.gz lwn-9b64f57ddf8673d29fafb3405d4aa1e93f5a4cd7.zip | |
btrfs: convert btrfs_transaction.use_count 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/extent-tree.c')
| -rw-r--r-- | fs/btrfs/extent-tree.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index be5477676cc8..85e51f311b57 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -10850,7 +10850,7 @@ static int btrfs_trim_free_extents(struct btrfs_device *device, spin_lock(&fs_info->trans_lock); trans = fs_info->running_transaction; if (trans) - atomic_inc(&trans->use_count); + refcount_inc(&trans->use_count); spin_unlock(&fs_info->trans_lock); ret = find_free_dev_extent_start(trans, device, minlen, start, |