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Message-Id: <20190814165745.372646143@linuxfoundation.org>
Date: Wed, 14 Aug 2019 19:01:01 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Gary R Hook <gary.hook@....com>,
Herbert Xu <herbert@...dor.apana.org.au>
Subject: [PATCH 4.14 03/69] crypto: ccp - Ignore tag length when decrypting GCM ciphertext
From: Gary R Hook <gary.hook@....com>
commit e2664ecbb2f26225ac6646876f2899558ffb2604 upstream.
AES GCM input buffers for decryption contain AAD+CTEXT+TAG. Only
decrypt the ciphertext, and use the tag for comparison.
Fixes: 36cf515b9bbe2 ("crypto: ccp - Enable support for AES GCM on v5 CCPs")
Cc: <stable@...r.kernel.org>
Signed-off-by: Gary R Hook <gary.hook@....com>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
drivers/crypto/ccp/ccp-ops.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
--- a/drivers/crypto/ccp/ccp-ops.c
+++ b/drivers/crypto/ccp/ccp-ops.c
@@ -752,8 +752,7 @@ static int ccp_run_aes_gcm_cmd(struct cc
while (src.sg_wa.bytes_left) {
ccp_prepare_data(&src, &dst, &op, AES_BLOCK_SIZE, true);
if (!src.sg_wa.bytes_left) {
- unsigned int nbytes = aes->src_len
- % AES_BLOCK_SIZE;
+ unsigned int nbytes = ilen % AES_BLOCK_SIZE;
if (nbytes) {
op.eom = 1;
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