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| author | Elena Reshetova <elena.reshetova@intel.com> | 2017-03-03 10:55:12 +0200 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2017-04-18 14:07:23 +0200 |
| commit | 490b54d6fb75f6ffd0471ec58bb38a992e2b40cd (patch) | |
| tree | a7f431ea6a0f4369ba43be8736090efd54d6998b /fs/btrfs/extent_map.h | |
| parent | 9b64f57ddf8673d29fafb3405d4aa1e93f5a4cd7 (diff) | |
| download | linux-490b54d6fb75f6ffd0471ec58bb38a992e2b40cd.tar.gz linux-490b54d6fb75f6ffd0471ec58bb38a992e2b40cd.tar.bz2 linux-490b54d6fb75f6ffd0471ec58bb38a992e2b40cd.zip | |
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.h | 3 |
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; }; |