linux-kernel - [PATCH 5.0 039/123] crypto: caam/qi2 - fix zero-length buffer DMA mapping

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Message-Id: <20190520115247.318383594@linuxfoundation.org>
Date:   Mon, 20 May 2019 14:13:39 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Horia Geantă <horia.geanta@....com>,
        Herbert Xu <herbert@...dor.apana.org.au>
Subject: [PATCH 5.0 039/123] crypto: caam/qi2 - fix zero-length buffer DMA mapping

From: Horia Geantă <horia.geanta@....com>

commit 07586d3ddf284dd7a1a6579579d8efa7296fe60f upstream.

Commit 04e6d25c5bb2 ("crypto: caam - fix zero-length buffer DMA mapping")
fixed an issue in caam/jr driver where ahash implementation was
DMA mapping a zero-length buffer.

Current commit applies a similar fix for caam/qi2 driver.

Cc: <stable@...r.kernel.org> # v4.20+
Fixes: 3f16f6c9d632 ("crypto: caam/qi2 - add support for ahash algorithms")
Signed-off-by: Horia Geantă <horia.geanta@....com>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/crypto/caam/caamalg_qi2.c |   25 ++++++++++++++++++-------
 1 file changed, 18 insertions(+), 7 deletions(-)

--- a/drivers/crypto/caam/caamalg_qi2.c
+++ b/drivers/crypto/caam/caamalg_qi2.c
@@ -3756,10 +3756,13 @@ static int ahash_final_no_ctx(struct aha
 	if (!edesc)
 		return ret;
 
-	state->buf_dma = dma_map_single(ctx->dev, buf, buflen, DMA_TO_DEVICE);
-	if (dma_mapping_error(ctx->dev, state->buf_dma)) {
-		dev_err(ctx->dev, "unable to map src\n");
-		goto unmap;
+	if (buflen) {
+		state->buf_dma = dma_map_single(ctx->dev, buf, buflen,
+						DMA_TO_DEVICE);
+		if (dma_mapping_error(ctx->dev, state->buf_dma)) {
+			dev_err(ctx->dev, "unable to map src\n");
+			goto unmap;
+		}
 	}
 
 	edesc->dst_dma = dma_map_single(ctx->dev, req->result, digestsize,
@@ -3772,9 +3775,17 @@ static int ahash_final_no_ctx(struct aha
 
 	memset(&req_ctx->fd_flt, 0, sizeof(req_ctx->fd_flt));
 	dpaa2_fl_set_final(in_fle, true);
-	dpaa2_fl_set_format(in_fle, dpaa2_fl_single);
-	dpaa2_fl_set_addr(in_fle, state->buf_dma);
-	dpaa2_fl_set_len(in_fle, buflen);
+	/*
+	 * crypto engine requires the input entry to be present when
+	 * "frame list" FD is used.
+	 * Since engine does not support FMT=2'b11 (unused entry type), leaving
+	 * in_fle zeroized (except for "Final" flag) is the best option.
+	 */
+	if (buflen) {
+		dpaa2_fl_set_format(in_fle, dpaa2_fl_single);
+		dpaa2_fl_set_addr(in_fle, state->buf_dma);
+		dpaa2_fl_set_len(in_fle, buflen);
+	}
 	dpaa2_fl_set_format(out_fle, dpaa2_fl_single);
 	dpaa2_fl_set_addr(out_fle, edesc->dst_dma);
 	dpaa2_fl_set_len(out_fle, digestsize);