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btrfs: convert extent_map.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 10:55:12 +02:00 • committed by David Sterba
parent 9b64f57ddf
commit 490b54d6fb
6 changed files with 12 additions and 11 deletions
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3
fs/btrfs/extent_map.h
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@ -2,6 +2,7 @@
#define __EXTENTMAP__
#include <linux/rbtree.h>
#include <linux/refcount.h>
#define EXTENT_MAP_LAST_BYTE ((u64)-4)
#define EXTENT_MAP_HOLE ((u64)-3)
@ -41,7 +42,7 @@ struct extent_map {
*/
struct map_lookup *map_lookup;
};
atomic_t refs;
refcount_t refs;
unsigned int compress_type;
struct list_head list;
};