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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/transaction.h | |
| parent | btrfs: convert btrfs_bio.refs from atomic_t to refcount_t (diff) | |
| download | linux-dev-9b64f57ddf8673d29fafb3405d4aa1e93f5a4cd7.tar.xz linux-dev-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/transaction.h')
| -rw-r--r-- | fs/btrfs/transaction.h | 4 |
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; |