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btrfs: convert btrfs_ordered_extent.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>
This commit is contained in:
Elena Reshetova 2017-03-03 10:55:13 +02:00 committed by David Sterba
parent 490b54d6fb
commit e76edab7f0
3 changed files with 11 additions and 11 deletions
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18
fs/btrfs/ordered-data.c
View File

@ -212,7 +212,7 @@ static int __btrfs_add_ordered_extent(struct inode *inode, u64 file_offset,
set_bit(BTRFS_ORDERED_DIRECT, &entry->flags);
/* one ref for the tree */
atomic_set(&entry->refs, 1);
refcount_set(&entry->refs, 1);
init_waitqueue_head(&entry->wait);
INIT_LIST_HEAD(&entry->list);
INIT_LIST_HEAD(&entry->root_extent_list);
@ -358,7 +358,7 @@ int btrfs_dec_test_first_ordered_pending(struct inode *inode,
out:
if (!ret && cached && entry) {
*cached = entry;
atomic_inc(&entry->refs);
refcount_inc(&entry->refs);
}
spin_unlock_irqrestore(&tree->lock, flags);
return ret == 0;
@ -425,7 +425,7 @@ have_entry:
out:
if (!ret && cached && entry) {
*cached = entry;
atomic_inc(&entry->refs);
refcount_inc(&entry->refs);
}
spin_unlock_irqrestore(&tree->lock, flags);
return ret == 0;
@ -456,7 +456,7 @@ void btrfs_get_logged_extents(struct btrfs_inode *inode,
if (test_and_set_bit(BTRFS_ORDERED_LOGGED, &ordered->flags))
continue;
list_add(&ordered->log_list, logged_list);
atomic_inc(&ordered->refs);
refcount_inc(&ordered->refs);
}
spin_unlock_irq(&tree->lock);
}
@ -565,7 +565,7 @@ void btrfs_put_ordered_extent(struct btrfs_ordered_extent *entry)
trace_btrfs_ordered_extent_put(entry->inode, entry);
if (atomic_dec_and_test(&entry->refs)) {
if (refcount_dec_and_test(&entry->refs)) {
ASSERT(list_empty(&entry->log_list));
ASSERT(list_empty(&entry->trans_list));
ASSERT(list_empty(&entry->root_extent_list));
@ -690,7 +690,7 @@ int btrfs_wait_ordered_extents(struct btrfs_root *root, int nr,
list_move_tail(&ordered->root_extent_list,
&root->ordered_extents);
atomic_inc(&ordered->refs);
refcount_inc(&ordered->refs);
spin_unlock(&root->ordered_extent_lock);
btrfs_init_work(&ordered->flush_work,
@ -870,7 +870,7 @@ struct btrfs_ordered_extent *btrfs_lookup_ordered_extent(struct inode *inode,
if (!offset_in_entry(entry, file_offset))
entry = NULL;
if (entry)
atomic_inc(&entry->refs);
refcount_inc(&entry->refs);
out:
spin_unlock_irq(&tree->lock);
return entry;
@ -911,7 +911,7 @@ struct btrfs_ordered_extent *btrfs_lookup_ordered_range(
}
out:
if (entry)
atomic_inc(&entry->refs);
refcount_inc(&entry->refs);
spin_unlock_irq(&tree->lock);
return entry;
}
@ -948,7 +948,7 @@ btrfs_lookup_first_ordered_extent(struct inode *inode, u64 file_offset)
goto out;
entry = rb_entry(node, struct btrfs_ordered_extent, rb_node);
atomic_inc(&entry->refs);
refcount_inc(&entry->refs);
out:
spin_unlock_irq(&tree->lock);
return entry;

2
fs/btrfs/ordered-data.h
View File

@ -113,7 +113,7 @@ struct btrfs_ordered_extent {
int compress_type;
/* reference count */
atomic_t refs;
refcount_t refs;
/* the inode we belong to */
struct inode *inode;

2
include/trace/events/btrfs.h
View File

@ -275,7 +275,7 @@ DECLARE_EVENT_CLASS(btrfs__ordered_extent,
__entry->bytes_left = ordered->bytes_left;
__entry->flags = ordered->flags;
__entry->compress_type = ordered->compress_type;
__entry->refs = atomic_read(&ordered->refs);
__entry->refs = refcount_read(&ordered->refs);
__entry->root_objectid =
BTRFS_I(inode)->root->root_key.objectid;
__entry->truncated_len = ordered->truncated_len;