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btrfs: convert btrfs_delayed_node.refs from atomic_t to refcount_t

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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 10:55:16 +02:00
committed by David Sterba
parent 6df8cdf5bd
commit 6de5f18e7b
2 changed files with 16 additions and 16 deletions
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4
fs/btrfs/delayed-inode.h
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@@ -26,7 +26,7 @@
#include <linux/list.h>
#include <linux/wait.h>
#include <linux/atomic.h>
#include <linux/refcount.h>
#include "ctree.h"
/* types of the delayed item */
@@ -67,7 +67,7 @@ struct btrfs_delayed_node {
struct rb_root del_root;
struct mutex mutex;
struct btrfs_inode_item inode_item;
atomic_t refs;
refcount_t refs;
u64 index_cnt;
unsigned long flags;
int count;