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authorElena Reshetova <elena.reshetova@intel.com>2017-03-03 11:55:18 +0300
committerDavid Sterba <dsterba@suse.com>2017-04-18 15:07:23 +0300
commit0700cea7c8b387c8c6bc4de79b197baa0b3fc4a3 (patch)
tree7bec132f997899bc7000ed108d539067438fd21f /fs/btrfs/disk-io.h
parent089e77e10d7e44a007101cf7323dc7bda66172f4 (diff)
downloadlinux-0700cea7c8b387c8c6bc4de79b197baa0b3fc4a3.tar.xz
btrfs: convert btrfs_root.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>
Diffstat (limited to 'fs/btrfs/disk-io.h')
-rw-r--r--fs/btrfs/disk-io.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h
index 2e0ec29bfd69..21f1ceb85b76 100644
--- a/fs/btrfs/disk-io.h
+++ b/fs/btrfs/disk-io.h
@@ -101,14 +101,14 @@ struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info);
*/
static inline struct btrfs_root *btrfs_grab_fs_root(struct btrfs_root *root)
{
- if (atomic_inc_not_zero(&root->refs))
+ if (refcount_inc_not_zero(&root->refs))
return root;
return NULL;
}
static inline void btrfs_put_fs_root(struct btrfs_root *root)
{
- if (atomic_dec_and_test(&root->refs))
+ if (refcount_dec_and_test(&root->refs))
kfree(root);
}