The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 07bfd9bdf568a38d9440c607b72342036011f727 Mon Sep 17 00:00:00 2001

From: Herbert Xu herbert@gondor.apana.org.au Date: Tue, 19 Nov 2019 17:41:31 +0800 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@vger.kernel.org Signed-off-by: Herbert Xu herbert@gondor.apana.org.au

diff --git a/crypto/pcrypt.c b/crypto/pcrypt.c index 543792e0ebf0..81bbea7f2ba6 100644 --- a/crypto/pcrypt.c +++ b/crypto/pcrypt.c @@ -362,11 +362,12 @@ 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);