linux-kernel - [PATCH 5.6 096/161] crypto: algapi - Avoid spurious modprobe on LOADED

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Message-Id: <20200616153110.949933399@linuxfoundation.org>
Date:   Tue, 16 Jun 2020 17:34:46 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Eric Biggers <ebiggers@...gle.com>,
        Herbert Xu <herbert@...dor.apana.org.au>
Subject: [PATCH 5.6 096/161] crypto: algapi - Avoid spurious modprobe on LOADED

From: Eric Biggers <ebiggers@...gle.com>

commit beeb460cd12ac9b91640b484b6a52dcba9d9fc8f upstream.

Currently after any algorithm is registered and tested, there's an
unnecessary request_module("cryptomgr") even if it's already loaded.
Also, CRYPTO_MSG_ALG_LOADED is sent twice, and thus if the algorithm is
"crct10dif", lib/crc-t10dif.c replaces the tfm twice rather than once.

This occurs because CRYPTO_MSG_ALG_LOADED is sent using
crypto_probing_notify(), which tries to load "cryptomgr" if the
notification is not handled (NOTIFY_DONE).  This doesn't make sense
because "cryptomgr" doesn't handle this notification.

Fix this by using crypto_notify() instead of crypto_probing_notify().

Fixes: dd8b083f9a5e ("crypto: api - Introduce notifier for new crypto algorithms")
Cc: <stable@...r.kernel.org> # v4.20+
Cc: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Eric Biggers <ebiggers@...gle.com>
Reviewed-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 crypto/algapi.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/crypto/algapi.c
+++ b/crypto/algapi.c
@@ -403,7 +403,7 @@ static void crypto_wait_for_test(struct
 	err = wait_for_completion_killable(&larval->completion);
 	WARN_ON(err);
 	if (!err)
-		crypto_probing_notify(CRYPTO_MSG_ALG_LOADED, larval);
+		crypto_notify(CRYPTO_MSG_ALG_LOADED, larval);

 out:
 	crypto_larval_kill(&larval->alg);