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https://github.com/coolsnowwolf/lede.git
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90 lines
3.1 KiB
Diff
90 lines
3.1 KiB
Diff
From 686aa4db696270dadc5e8b2971769e1676251ff1 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, 31 Jan 2020 17:43:16 -0300
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Subject: [PATCH] crypto: qce - use cryptlen when adding extra sgl
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The qce crypto driver appends an extra entry to the dst sgl, to maintain
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private state information.
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When the gcm driver sends requests to the ctr skcipher, it passes the
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authentication tag after the actual crypto payload, but it must not be
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touched.
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Commit 1336c2221bee ("crypto: qce - save a sg table slot for result
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buf") limited the destination sgl to avoid overwriting the
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authentication tag but it assumed the tag would be in a separate sgl
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entry.
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This is not always the case, so it is better to limit the length of the
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destination buffer to req->cryptlen before appending the result buf.
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Signed-off-by: Eneas U de Queiroz <cotequeiroz@gmail.com>
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diff --git a/drivers/crypto/qce/dma.c b/drivers/crypto/qce/dma.c
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index db560c3d3e4f..0ae9d28afa69 100644
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--- a/drivers/crypto/qce/dma.c
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+++ b/drivers/crypto/qce/dma.c
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@@ -56,9 +56,10 @@ void qce_dma_release(struct qce_dma_data *dma)
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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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- int max_ents)
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+ unsigned int max_len)
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{
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struct scatterlist *sg = sgt->sgl, *sg_last = NULL;
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+ unsigned int new_len;
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while (sg) {
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if (!sg_page(sg))
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@@ -69,13 +70,13 @@ qce_sgtable_add(struct sg_table *sgt, struct scatterlist *new_sgl,
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if (!sg)
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return ERR_PTR(-EINVAL);
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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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+ while (new_sgl && sg && max_len) {
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+ new_len = new_sgl->length > max_len ? max_len : new_sgl->length;
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+ sg_set_page(sg, sg_page(new_sgl), new_len, 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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+ max_len -= new_len;
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}
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return sg_last;
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diff --git a/drivers/crypto/qce/dma.h b/drivers/crypto/qce/dma.h
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index 0be71f7f7a58..710d5e370293 100644
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--- a/drivers/crypto/qce/dma.h
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+++ b/drivers/crypto/qce/dma.h
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@@ -51,6 +51,6 @@ 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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- int max_ents);
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+ unsigned int max_len);
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#endif /* _DMA_H_ */
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diff --git a/drivers/crypto/qce/skcipher.c b/drivers/crypto/qce/skcipher.c
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index 5af74f2431ca..188eb234ba2c 100644
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--- a/drivers/crypto/qce/skcipher.c
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+++ b/drivers/crypto/qce/skcipher.c
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@@ -105,13 +105,14 @@ qce_skcipher_async_req_handle(struct crypto_async_request *async_req)
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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, rctx->dst_nents - 1);
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+ sg = qce_sgtable_add(&rctx->dst_tbl, req->dst, req->cryptlen);
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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, 1);
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+ sg = qce_sgtable_add(&rctx->dst_tbl, &rctx->result_sg,
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+ QCE_RESULT_BUF_SZ);
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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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