[PATCH 4.19 035/271] crypto: talitos - properly handle split ICV.

From: Greg Kroah-Hartman
Date: Wed Jul 24 2019 - 16:08:08 EST


[ Upstream commit eae55a586c3c8b50982bad3c3426e9c9dd7a0075 ]

The driver assumes that the ICV is as a single piece in the last
element of the scatterlist. This assumption is wrong.

This patch ensures that the ICV is properly handled regardless of
the scatterlist layout.

Fixes: 9c4a79653b35 ("crypto: talitos - Freescale integrated security engine (SEC) driver")
Signed-off-by: Christophe Leroy <christophe.leroy@xxxxxx>
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/crypto/talitos.c | 26 +++++++++++++++-----------
1 file changed, 15 insertions(+), 11 deletions(-)

diff --git a/drivers/crypto/talitos.c b/drivers/crypto/talitos.c
index d46f58c13433..254f711f1934 100644
--- a/drivers/crypto/talitos.c
+++ b/drivers/crypto/talitos.c
@@ -1001,7 +1001,6 @@ static void ipsec_esp_encrypt_done(struct device *dev,
unsigned int authsize = crypto_aead_authsize(authenc);
unsigned int ivsize = crypto_aead_ivsize(authenc);
struct talitos_edesc *edesc;
- struct scatterlist *sg;
void *icvdata;

edesc = container_of(desc, struct talitos_edesc, desc);
@@ -1015,9 +1014,8 @@ static void ipsec_esp_encrypt_done(struct device *dev,
else
icvdata = &edesc->link_tbl[edesc->src_nents +
edesc->dst_nents + 2];
- sg = sg_last(areq->dst, edesc->dst_nents);
- memcpy((char *)sg_virt(sg) + sg->length - authsize,
- icvdata, authsize);
+ sg_pcopy_from_buffer(areq->dst, edesc->dst_nents ? : 1, icvdata,
+ authsize, areq->assoclen + areq->cryptlen);
}

dma_unmap_single(dev, edesc->iv_dma, ivsize, DMA_TO_DEVICE);
@@ -1035,7 +1033,6 @@ static void ipsec_esp_decrypt_swauth_done(struct device *dev,
struct crypto_aead *authenc = crypto_aead_reqtfm(req);
unsigned int authsize = crypto_aead_authsize(authenc);
struct talitos_edesc *edesc;
- struct scatterlist *sg;
char *oicv, *icv;
struct talitos_private *priv = dev_get_drvdata(dev);
bool is_sec1 = has_ftr_sec1(priv);
@@ -1045,9 +1042,18 @@ static void ipsec_esp_decrypt_swauth_done(struct device *dev,
ipsec_esp_unmap(dev, edesc, req);

if (!err) {
+ char icvdata[SHA512_DIGEST_SIZE];
+ int nents = edesc->dst_nents ? : 1;
+ unsigned int len = req->assoclen + req->cryptlen;
+
/* auth check */
- sg = sg_last(req->dst, edesc->dst_nents ? : 1);
- icv = (char *)sg_virt(sg) + sg->length - authsize;
+ if (nents > 1) {
+ sg_pcopy_to_buffer(req->dst, nents, icvdata, authsize,
+ len - authsize);
+ icv = icvdata;
+ } else {
+ icv = (char *)sg_virt(req->dst) + len - authsize;
+ }

if (edesc->dma_len) {
if (is_sec1)
@@ -1463,7 +1469,6 @@ static int aead_decrypt(struct aead_request *req)
struct talitos_ctx *ctx = crypto_aead_ctx(authenc);
struct talitos_private *priv = dev_get_drvdata(ctx->dev);
struct talitos_edesc *edesc;
- struct scatterlist *sg;
void *icvdata;

req->cryptlen -= authsize;
@@ -1497,9 +1502,8 @@ static int aead_decrypt(struct aead_request *req)
else
icvdata = &edesc->link_tbl[0];

- sg = sg_last(req->src, edesc->src_nents ? : 1);
-
- memcpy(icvdata, (char *)sg_virt(sg) + sg->length - authsize, authsize);
+ sg_pcopy_to_buffer(req->src, edesc->src_nents ? : 1, icvdata, authsize,
+ req->assoclen + req->cryptlen - authsize);

return ipsec_esp(edesc, req, ipsec_esp_decrypt_swauth_done);
}
--
2.20.1