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btrfs: convert btrfs_delayed_item.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 10:55:17 +02:00
committed by David Sterba
parent 6de5f18e7b
commit 089e77e10d
2 changed files with 10 additions and 10 deletions
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2
fs/btrfs/delayed-inode.h
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@@ -80,7 +80,7 @@ struct btrfs_delayed_item {
struct list_head readdir_list; /* used for readdir items */
u64 bytes_reserved;
struct btrfs_delayed_node *delayed_node;
atomic_t refs;
refcount_t refs;
int ins_or_del;
u32 data_len;
char data[0];