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authorElena Reshetova <elena.reshetova@intel.com>2017-03-03 10:55:12 +0200
committerDavid Sterba <dsterba@suse.com>2017-04-18 14:07:23 +0200
commit490b54d6fb75f6ffd0471ec58bb38a992e2b40cd (patch)
treea7f431ea6a0f4369ba43be8736090efd54d6998b /fs/btrfs/extent_map.h
parent9b64f57ddf8673d29fafb3405d4aa1e93f5a4cd7 (diff)
btrfs: convert extent_map.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>
Diffstat (limited to 'fs/btrfs/extent_map.h')
-rw-r--r--fs/btrfs/extent_map.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/btrfs/extent_map.h b/fs/btrfs/extent_map.h
index eb8b8fae036b..a67b2def5413 100644
--- a/fs/btrfs/extent_map.h
+++ b/fs/btrfs/extent_map.h
@@ -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;
};