diff options
| author | Horia Geantă <horia.geanta@nxp.com> | 2019-04-25 17:52:21 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-05-22 07:38:39 +0200 |
| commit | 0eaed393b4ec4d32fda43a2dbbb32530f7d6f346 (patch) | |
| tree | f6e9537e72a113f9a8f18a5dac14dbf9cefcd9e0 /drivers/crypto | |
| parent | 86add9b56835f4c8b3a3e6b7702b48c38cc3e5a7 (diff) | |
crypto: caam/qi2 - fix zero-length buffer DMA mapping
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@vger.kernel.org> # v4.20+
Fixes: 3f16f6c9d632 ("crypto: caam/qi2 - add support for ahash algorithms")
Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/crypto')
| -rw-r--r-- | drivers/crypto/caam/caamalg_qi2.c | 25 |
1 files changed, 18 insertions, 7 deletions
diff --git a/drivers/crypto/caam/caamalg_qi2.c b/drivers/crypto/caam/caamalg_qi2.c index 425d5d974613..1e70a82d0365 100644 --- 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 ahash_request *req) 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 ahash_request *req) 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); |