linux-kernel - [PATCH 5.5 53/56] crypto: pcrypt - Fix user-after-free on module unload

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Message-Id: <20200130183618.357157371@linuxfoundation.org>
Date:   Thu, 30 Jan 2020 19:39:10 +0100
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>
Subject: [PATCH 5.5 53/56] crypto: pcrypt - Fix user-after-free on module unload

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

commit 07bfd9bdf568a38d9440c607b72342036011f727 upstream.

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: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 crypto/pcrypt.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/crypto/pcrypt.c
+++ b/crypto/pcrypt.c
@@ -362,11 +362,12 @@ err:
 
 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);
 }
 
 subsys_initcall(pcrypt_init);