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btrfs: convert btrfs_transaction.use_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 10:55:11 +02:00 • committed by David Sterba
parent 140475ae4a
commit 9b64f57ddf
5 changed files with 16 additions and 14 deletions
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2
fs/btrfs/ordered-data.c
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@ -623,7 +623,7 @@ void btrfs_remove_ordered_extent(struct inode *inode,
spin_lock(&fs_info->trans_lock);
trans = fs_info->running_transaction;
if (trans)
atomic_inc(&trans->use_count);
refcount_inc(&trans->use_count);
spin_unlock(&fs_info->trans_lock);
ASSERT(trans);