crypto: af_alg - Disallow multiple in-flight AIO requests

stable inclusion
from stable-v4.19.306
commit 19af0310c8767c993f2a5d5261e4df3f9f465ce1
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I970CO


CVE: NA

--------------------------------

[ Upstream commit 67b164a871af1d736f131fd6fe78a610909f06f3 ]

Having multiple in-flight AIO requests results in unpredictable
output because they all share the same IV.  Fix this by only allowing
one request at a time.

Fixes: 83094e5e ("crypto: af_alg - add async support to algif_aead")
Fixes: a596999b ("crypto: algif - change algif_skcipher to be asynchronous")
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Yongqiang Liu <liuyongqiang13@huawei.com>