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btrfs: convert btrfs_caching_control.count 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 10:55:14 +02:00
committed by David Sterba
parent e76edab7f0
commit 1e4f4714d5
2 changed files with 8 additions and 7 deletions
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3
fs/btrfs/ctree.h
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@@ -39,6 +39,7 @@
#include <linux/security.h>
#include <linux/sizes.h>
#include <linux/dynamic_debug.h>
#include <linux/refcount.h>
#include "extent_io.h"
#include "extent_map.h"
#include "async-thread.h"
@@ -518,7 +519,7 @@ struct btrfs_caching_control {
struct btrfs_work work;
struct btrfs_block_group_cache *block_group;
u64 progress;
atomic_t count;
refcount_t count;
};
/* Once caching_thread() finds this much free space, it will wake up waiters. */