crypto: seqiv - Handle EBUSY correctly

stable inclusion
from stable-v4.19.276
commit 1effbddaff60eeef8017c6dea1ee0ed970164d14
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I6TIG1
CVE: NA

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

[ Upstream commit 32e62025 ]

As it is seqiv only handles the special return value of EINPROGERSS,
which means that in all other cases it will free data related to the
request.

However, as the caller of seqiv may specify MAY_BACKLOG, we also need
to expect EBUSY and treat it in the same way.  Otherwise backlogged
requests will trigger a use-after-free.

Fixes: 0a270321 ("[CRYPTO] seqiv: Add Sequence Number IV Generator")
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NYongqiang Liu <liuyongqiang13@huawei.com>

crypto/seqiv.c

@@ -30,7 +30,7 @@ static void seqiv_aead_encrypt_complete2(struct aead_request *req, int err)
 	struct aead_request *subreq = aead_request_ctx(req);
 	struct crypto_aead *geniv;
 
-	if (err == -EINPROGRESS)
+	if (err == -EINPROGRESS || err == -EBUSY)
 		return;
 
 	if (err)