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86 lines
2.9 KiB
Diff
86 lines
2.9 KiB
Diff
From 3ee50c896d712dc2fc8f34c2cd1918d035e74045 Mon Sep 17 00:00:00 2001
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From: Eneas U de Queiroz <cotequeiroz@gmail.com>
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Date: Fri, 20 Dec 2019 16:02:15 -0300
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Subject: [PATCH 04/11] crypto: qce - save a sg table slot for result buf
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When ctr-aes-qce is used for gcm-mode, an extra sg entry for the
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authentication tag is present, causing trouble when the qce driver
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prepares the dst-results sg table for dma.
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It computes the number of entries needed with sg_nents_for_len, leaving
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out the tag entry. Then it creates a sg table with that number plus
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one, used to store a result buffer.
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When copying the sg table, there's no limit to the number of entries
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copied, so the extra slot is filled with the authentication tag sg.
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When the driver tries to add the result sg, the list is full, and it
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returns EINVAL.
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By limiting the number of sg entries copied to the dest table, the slot
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for the result buffer is guaranteed to be unused.
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Signed-off-by: Eneas U de Queiroz <cotequeiroz@gmail.com>
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Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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---
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drivers/crypto/qce/dma.c | 6 ++++--
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drivers/crypto/qce/dma.h | 3 ++-
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drivers/crypto/qce/skcipher.c | 4 ++--
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3 files changed, 8 insertions(+), 5 deletions(-)
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--- a/drivers/crypto/qce/dma.c
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+++ b/drivers/crypto/qce/dma.c
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@@ -47,7 +47,8 @@ void qce_dma_release(struct qce_dma_data
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}
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struct scatterlist *
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-qce_sgtable_add(struct sg_table *sgt, struct scatterlist *new_sgl)
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+qce_sgtable_add(struct sg_table *sgt, struct scatterlist *new_sgl,
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+ int max_ents)
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{
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struct scatterlist *sg = sgt->sgl, *sg_last = NULL;
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@@ -60,12 +61,13 @@ qce_sgtable_add(struct sg_table *sgt, st
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if (!sg)
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return ERR_PTR(-EINVAL);
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- while (new_sgl && sg) {
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+ while (new_sgl && sg && max_ents) {
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sg_set_page(sg, sg_page(new_sgl), new_sgl->length,
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new_sgl->offset);
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sg_last = sg;
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sg = sg_next(sg);
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new_sgl = sg_next(new_sgl);
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+ max_ents--;
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}
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return sg_last;
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--- a/drivers/crypto/qce/dma.h
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+++ b/drivers/crypto/qce/dma.h
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@@ -42,6 +42,7 @@ int qce_dma_prep_sgs(struct qce_dma_data
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void qce_dma_issue_pending(struct qce_dma_data *dma);
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int qce_dma_terminate_all(struct qce_dma_data *dma);
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struct scatterlist *
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-qce_sgtable_add(struct sg_table *sgt, struct scatterlist *sg_add);
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+qce_sgtable_add(struct sg_table *sgt, struct scatterlist *sg_add,
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+ int max_ents);
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#endif /* _DMA_H_ */
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--- a/drivers/crypto/qce/skcipher.c
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+++ b/drivers/crypto/qce/skcipher.c
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@@ -95,13 +95,13 @@ qce_skcipher_async_req_handle(struct cry
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sg_init_one(&rctx->result_sg, qce->dma.result_buf, QCE_RESULT_BUF_SZ);
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- sg = qce_sgtable_add(&rctx->dst_tbl, req->dst);
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+ sg = qce_sgtable_add(&rctx->dst_tbl, req->dst, rctx->dst_nents - 1);
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if (IS_ERR(sg)) {
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ret = PTR_ERR(sg);
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goto error_free;
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}
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- sg = qce_sgtable_add(&rctx->dst_tbl, &rctx->result_sg);
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+ sg = qce_sgtable_add(&rctx->dst_tbl, &rctx->result_sg, 1);
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if (IS_ERR(sg)) {
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ret = PTR_ERR(sg);
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goto error_free;
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