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The AEAD code path incorrectly uses the child tfm to track the
cryptd refcnt, and then potentially frees the child tfm.
Fixes: 81760ea6a9 ("crypto: cryptd - Add helpers to check...")
Reported-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>