btrfs: convert btrfs_bio.refs from atomic_t to refcount_t
authorElena Reshetova <elena.reshetova@intel.com>
Fri, 3 Mar 2017 08:55:10 +0000 (10:55 +0200)
committerDavid Sterba <dsterba@suse.com>
Tue, 18 Apr 2017 12:07:23 +0000 (14:07 +0200)
commit140475ae4ad10d140bb69572499b1ff87367e807
tree030cedc7593bdcfab1149239a77010427afe48bf
parentf95fda8751b7b243c810805d1deaae502716d8fb
btrfs: convert btrfs_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/volumes.c
fs/btrfs/volumes.h