btrfs: convert btrfs_raid_bio.refs from atomic_t to refcount_t
authorElena Reshetova <elena.reshetova@intel.com>
Fri, 3 Mar 2017 08:55:26 +0000 (10:55 +0200)
committerDavid Sterba <dsterba@suse.com>
Tue, 18 Apr 2017 12:07:24 +0000 (14:07 +0200)
commitdec95574f4e6545c701420b950278dc6f55d0368
tree3101aa19b180d3e462f7e2c60f1577cbf06db9a2
parent99f4cdb16f80e1b30392b479d852036f87394b20
btrfs: convert btrfs_raid_bio.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>
fs/btrfs/raid56.c