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btrfs: convert btrfs_ordered_extent.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 10:55:13 +02:00
committed by David Sterba
parent 490b54d6fb
commit e76edab7f0
3 changed files with 11 additions and 11 deletions
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2
include/trace/events/btrfs.h
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@@ -275,7 +275,7 @@ DECLARE_EVENT_CLASS(btrfs__ordered_extent,
__entry->bytes_left = ordered->bytes_left;
__entry->flags = ordered->flags;
__entry->compress_type = ordered->compress_type;
__entry->refs = atomic_read(&ordered->refs);
__entry->refs = refcount_read(&ordered->refs);
__entry->root_objectid =
BTRFS_I(inode)->root->root_key.objectid;
__entry->truncated_len = ordered->truncated_len;