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btrfs: convert btrfs_root.refs from atomic_t to refcount_t

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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>
This commit is contained in:
Elena Reshetova
2017-03-03 10:55:18 +02:00
committed by David Sterba
parent 089e77e10d
commit 0700cea7c8
3 changed files with 4 additions and 4 deletions
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2
fs/btrfs/ctree.h
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@ -1222,7 +1222,7 @@ struct btrfs_root {
dev_t anon_dev;
spinlock_t root_item_lock;
atomic_t refs;
refcount_t refs;
struct mutex delalloc_mutex;
spinlock_t delalloc_lock;