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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>,
        Herbert Xu <herbert@gondor.apana.org.au>
Subject: [PATCH 4.20 088/145] crypto: cfb - fix decryption
Date:   Mon,  7 Jan 2019 13:32:05 +0100
Message-Id: <20190107104448.739785916@linuxfoundation.org>
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4.20-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>

commit fa4600734b74f74d9169c3015946d4722f8bcf79 upstream.

crypto_cfb_decrypt_segment() incorrectly XOR'ed generated keystream with
IV, rather than with data stream, resulting in incorrect decryption.
Test vectors will be added in the next patch.

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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

--- a/crypto/cfb.c
+++ b/crypto/cfb.c
@@ -144,7 +144,7 @@ static int crypto_cfb_decrypt_segment(st
 
 	do {
 		crypto_cfb_encrypt_one(tfm, iv, dst);
-		crypto_xor(dst, iv, bsize);
+		crypto_xor(dst, src, bsize);
 		iv = src;
 
 		src += bsize;