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

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Message-ID: <20191119094131.x7gkxdi5clyxk3zd@gondor.apana.org.au>
Date:   Tue, 19 Nov 2019 17:41:31 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        Daniel Jordan <daniel.m.jordan@...cle.com>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] crypto: pcrypt - Fix user-after-free on module unload

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>

diff --git a/crypto/pcrypt.c b/crypto/pcrypt.c
index 543792e0ebf0..3e026e7a7e75 100644
--- a/crypto/pcrypt.c
+++ b/crypto/pcrypt.c
@@ -362,11 +392,12 @@ 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);
 }
 
 subsys_initcall(pcrypt_init);
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt