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authorElena Reshetova <elena.reshetova@intel.com>2017-03-03 11:55:11 +0300
committerDavid Sterba <dsterba@suse.com>2017-04-18 15:07:23 +0300
commit9b64f57ddf8673d29fafb3405d4aa1e93f5a4cd7 (patch)
treed2a39847438cd265d8c0dbc3c61550980753e59a /fs/btrfs/transaction.h
parent140475ae4ad10d140bb69572499b1ff87367e807 (diff)
downloadlinux-9b64f57ddf8673d29fafb3405d4aa1e93f5a4cd7.tar.xz
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/transaction.h')
-rw-r--r--fs/btrfs/transaction.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/btrfs/transaction.h b/fs/btrfs/transaction.h
index 5dfb5590fff6..902619f83db6 100644
--- a/fs/btrfs/transaction.h
+++ b/fs/btrfs/transaction.h
@@ -18,6 +18,8 @@
#ifndef __BTRFS_TRANSACTION__
#define __BTRFS_TRANSACTION__
+
+#include <linux/refcount.h>
#include "btrfs_inode.h"
#include "delayed-ref.h"
#include "ctree.h"
@@ -49,7 +51,7 @@ struct btrfs_transaction {
* transaction can end
*/
atomic_t num_writers;
- atomic_t use_count;
+ refcount_t use_count;
atomic_t pending_ordered;
unsigned long flags;