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80 lines
2.6 KiB
Diff
80 lines
2.6 KiB
Diff
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From 31f796293b6c38126a466414c565827b9cfdbe39 Mon Sep 17 00:00:00 2001
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From: Eneas U de Queiroz <cotequeiroz@gmail.com>
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Date: Wed, 20 Nov 2019 21:39:11 -0300
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Subject: [PATCH] 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 eg 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" sg.
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When copying the sg table, it does not limit the number of entries
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copied, so tha 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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--- a/drivers/crypto/qce/dma.c
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+++ b/drivers/crypto/qce/dma.c
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@@ -55,7 +55,8 @@ 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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@@ -68,12 +69,13 @@ 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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@@ -50,6 +50,7 @@ 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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@@ -103,13 +103,13 @@ 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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