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btrfs: convert extent_state.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 10:55:19 +02:00
committed by David Sterba
parent 0700cea7c8
commit b7ac31b7b2
2 changed files with 9 additions and 8 deletions
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3
fs/btrfs/extent_io.h
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@@ -2,6 +2,7 @@
#define __EXTENTIO__
#include <linux/rbtree.h>
#include <linux/refcount.h>
#include "ulist.h"
/* bits for the extent state */
@@ -143,7 +144,7 @@ struct extent_state {
/* ADD NEW ELEMENTS AFTER THIS */
wait_queue_head_t wq;
atomic_t refs;
refcount_t refs;
unsigned state;
struct io_failure_record *failrec;