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From 31f796293b6c38126a466414c565827b9cfdbe39 Mon Sep 17 00:00:00 2001
From: Eneas U de Queiroz <cotequeiroz@gmail.com>
Date: Wed, 20 Nov 2019 21:39:11 -0300
Subject: [PATCH] crypto: qce - save a sg table slot for result buf
When ctr-aes-qce is used for gcm-mode, an extra sg entry for the
authentication tag is present, causing trouble when the qce driver
prepares the dst-results eg table for dma.
It computes the number of entries needed with sg_nents_for_len, leaving
out the tag entry. Then it creates a sg table with that number plus
one, used to store a "result" sg.
When copying the sg table, it does not limit the number of entries
copied, so tha extra slot is filled with the authentication tag sg.
When the driver tries to add the result sg, the list is full, and it
returns EINVAL.
By limiting the number of sg entries copied to the dest table, the slot
for the result buffer is guaranteed to be unused.
Signed-off-by: Eneas U de Queiroz <cotequeiroz@gmail.com>
--- a/drivers/crypto/qce/dma.c
+++ b/drivers/crypto/qce/dma.c
@@ -55,7 +55,8 @@ void qce_dma_release(struct qce_dma_data
}
struct scatterlist *
-qce_sgtable_add(struct sg_table *sgt, struct scatterlist *new_sgl)
+qce_sgtable_add(struct sg_table *sgt, struct scatterlist *new_sgl,
+ int max_ents)
{
struct scatterlist *sg = sgt->sgl, *sg_last = NULL;
@@ -68,12 +69,13 @@ qce_sgtable_add(struct sg_table *sgt, st
if (!sg)
return ERR_PTR(-EINVAL);
- while (new_sgl && sg) {
+ while (new_sgl && sg && max_ents) {
sg_set_page(sg, sg_page(new_sgl), new_sgl->length,
new_sgl->offset);
sg_last = sg;
sg = sg_next(sg);
new_sgl = sg_next(new_sgl);
+ max_ents--;
}
return sg_last;
--- a/drivers/crypto/qce/dma.h
+++ b/drivers/crypto/qce/dma.h
@@ -50,6 +50,7 @@ int qce_dma_prep_sgs(struct qce_dma_data
void qce_dma_issue_pending(struct qce_dma_data *dma);
int qce_dma_terminate_all(struct qce_dma_data *dma);
struct scatterlist *
-qce_sgtable_add(struct sg_table *sgt, struct scatterlist *sg_add);
+qce_sgtable_add(struct sg_table *sgt, struct scatterlist *sg_add,
+ int max_ents);
#endif /* _DMA_H_ */
--- a/drivers/crypto/qce/skcipher.c
+++ b/drivers/crypto/qce/skcipher.c
@@ -103,13 +103,13 @@ qce_skcipher_async_req_handle(struct cry
sg_init_one(&rctx->result_sg, qce->dma.result_buf, QCE_RESULT_BUF_SZ);
- sg = qce_sgtable_add(&rctx->dst_tbl, req->dst);
+ sg = qce_sgtable_add(&rctx->dst_tbl, req->dst, rctx->dst_nents - 1);
if (IS_ERR(sg)) {
ret = PTR_ERR(sg);
goto error_free;
}
- sg = qce_sgtable_add(&rctx->dst_tbl, &rctx->result_sg);
+ sg = qce_sgtable_add(&rctx->dst_tbl, &rctx->result_sg, 1);
if (IS_ERR(sg)) {
ret = PTR_ERR(sg);
goto error_free;
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