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Subject[PATCH 25/35] crypto: ccree: make AEAD sgl iterator well behaved
Date
Fix some scatter list interation code was not handling scatter lists
being shorter than expected in a graceful manner.

Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com>
---
drivers/crypto/ccree/cc_buffer_mgr.c | 55 +++++++++-------------------
1 file changed, 17 insertions(+), 38 deletions(-)

diff --git a/drivers/crypto/ccree/cc_buffer_mgr.c b/drivers/crypto/ccree/cc_buffer_mgr.c
index 86e498bee0bb..fa625bdde3f9 100644
--- a/drivers/crypto/ccree/cc_buffer_mgr.c
+++ b/drivers/crypto/ccree/cc_buffer_mgr.c
@@ -659,11 +659,9 @@ static int cc_aead_chain_assoc(struct cc_drvdata *drvdata,
{
struct aead_req_ctx *areq_ctx = aead_request_ctx(req);
int rc = 0;
- u32 mapped_nents = 0;
- struct scatterlist *current_sg = req->src;
+ int mapped_nents = 0;
struct crypto_aead *tfm = crypto_aead_reqtfm(req);
- unsigned int sg_index = 0;
- u32 size_of_assoc = areq_ctx->assoclen;
+ unsigned int size_of_assoc = areq_ctx->assoclen;
struct device *dev = drvdata_to_dev(drvdata);

if (areq_ctx->is_gcm4543)
@@ -684,26 +682,10 @@ static int cc_aead_chain_assoc(struct cc_drvdata *drvdata,
goto chain_assoc_exit;
}

- //iterate over the sgl to see how many entries are for associated data
- //it is assumed that if we reach here , the sgl is already mapped
- sg_index = current_sg->length;
- //the first entry in the scatter list contains all the associated data
- if (sg_index > size_of_assoc) {
- mapped_nents++;
- } else {
- while (sg_index <= size_of_assoc) {
- current_sg = sg_next(current_sg);
- /* if have reached the end of the sgl, then this is
- * unexpected
- */
- if (!current_sg) {
- dev_err(dev, "reached end of sg list. unexpected\n");
- return -EINVAL;
- }
- sg_index += current_sg->length;
- mapped_nents++;
- }
- }
+ mapped_nents = sg_nents_for_len(req->src, size_of_assoc);
+ if (mapped_nents < 0)
+ return mapped_nents;
+
if (mapped_nents > LLI_MAX_NUM_OF_ASSOC_DATA_ENTRIES) {
dev_err(dev, "Too many fragments. current %d max %d\n",
mapped_nents, LLI_MAX_NUM_OF_ASSOC_DATA_ENTRIES);
@@ -898,6 +880,7 @@ static int cc_aead_chain_data(struct cc_drvdata *drvdata,
u32 sg_index = 0;
bool is_gcm4543 = areq_ctx->is_gcm4543;
u32 size_to_skip = areq_ctx->assoclen;
+ struct scatterlist *sgl;

if (is_gcm4543)
size_to_skip += crypto_aead_ivsize(tfm);
@@ -920,15 +903,13 @@ static int cc_aead_chain_data(struct cc_drvdata *drvdata,
sg_index = areq_ctx->src_sgl->length;
//check where the data starts
while (sg_index <= size_to_skip) {
+ src_mapped_nents--;
offset -= areq_ctx->src_sgl->length;
- areq_ctx->src_sgl = sg_next(areq_ctx->src_sgl);
- //if have reached the end of the sgl, then this is unexpected
- if (!areq_ctx->src_sgl) {
- dev_err(dev, "reached end of sg list. unexpected\n");
- return -EINVAL;
- }
+ sgl = sg_next(areq_ctx->src_sgl);
+ if (!sgl)
+ break;
+ areq_ctx->src_sgl = sgl;
sg_index += areq_ctx->src_sgl->length;
- src_mapped_nents--;
}
if (src_mapped_nents > LLI_MAX_NUM_OF_DATA_ENTRIES) {
dev_err(dev, "Too many fragments. current %d max %d\n",
@@ -962,15 +943,13 @@ static int cc_aead_chain_data(struct cc_drvdata *drvdata,

//check where the data starts
while (sg_index <= size_to_skip) {
+ dst_mapped_nents--;
offset -= areq_ctx->dst_sgl->length;
- areq_ctx->dst_sgl = sg_next(areq_ctx->dst_sgl);
- //if have reached the end of the sgl, then this is unexpected
- if (!areq_ctx->dst_sgl) {
- dev_err(dev, "reached end of sg list. unexpected\n");
- return -EINVAL;
- }
+ sgl = sg_next(areq_ctx->dst_sgl);
+ if (!sgl)
+ break;
+ areq_ctx->dst_sgl = sgl;
sg_index += areq_ctx->dst_sgl->length;
- dst_mapped_nents--;
}
if (dst_mapped_nents > LLI_MAX_NUM_OF_DATA_ENTRIES) {
dev_err(dev, "Too many fragments. current %d max %d\n",
--
2.21.0
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