linux-kernel - [PATCH 4.9 27/68] crypto: pcrypt - Fix user-after-free on module unload

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Message-Id: <20200203161909.512953235@linuxfoundation.org>
Date:   Mon,  3 Feb 2020 16:19:23 +0000
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Herbert Xu <herbert@...dor.apana.org.au>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.9 27/68] crypto: pcrypt - Fix user-after-free on module unload

From: Herbert Xu <herbert@...dor.apana.org.au>

[ Upstream commit 07bfd9bdf568a38d9440c607b72342036011f727 ]

On module unload of pcrypt we must unregister the crypto algorithms
first and then tear down the padata structure.  As otherwise the
crypto algorithms are still alive and can be used while the padata
structure is being freed.

Fixes: 5068c7a883d1 ("crypto: pcrypt - Add pcrypt crypto...")
Cc: <stable@...r.kernel.org>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 crypto/pcrypt.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/crypto/pcrypt.c b/crypto/pcrypt.c
index a5718c0a3dc4e..1348541da463a 100644
--- a/crypto/pcrypt.c
+++ b/crypto/pcrypt.c
@@ -505,11 +505,12 @@ static int __init pcrypt_init(void)
 
 static void __exit pcrypt_exit(void)
 {
+	crypto_unregister_template(&pcrypt_tmpl);
+
 	pcrypt_fini_padata(&pencrypt);
 	pcrypt_fini_padata(&pdecrypt);
 
 	kset_unregister(pcrypt_kset);
-	crypto_unregister_template(&pcrypt_tmpl);
 }
 
 module_init(pcrypt_init);
-- 
2.20.1