[PATCH 5.13 160/800] crypto: ecdh - fix ecdh_init

[Greg Kroah-Hartman]

From: Hui Tang <tanghui20@xxxxxxxxxx>

[ Upstream commit 8fd28fa5046b377039d5bbc0ab2f625dec703980 ]

NIST P192 is not unregistered if failed to register NIST P256,
actually it need to unregister the algorithms already registered.

Signed-off-by: Hui Tang <tanghui20@xxxxxxxxxx>
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 crypto/ecdh.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/crypto/ecdh.c b/crypto/ecdh.c
index 4227d35f5485..e2c480859024 100644
--- a/crypto/ecdh.c
+++ b/crypto/ecdh.c
@@ -183,7 +183,16 @@ static int ecdh_init(void)
 	ret = crypto_register_kpp(&ecdh_nist_p192);
 	ecdh_nist_p192_registered = ret == 0;
 
-	return crypto_register_kpp(&ecdh_nist_p256);
+	ret = crypto_register_kpp(&ecdh_nist_p256);
+	if (ret)
+		goto nist_p256_error;
+
+	return 0;
+
+nist_p256_error:
+	if (ecdh_nist_p192_registered)
+		crypto_unregister_kpp(&ecdh_nist_p192);
+	return ret;
 }
 
 static void ecdh_exit(void)
-- 
2.30.2