From: Horia Geantă horia.geanta@nxp.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@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
--- 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 @@ -3755,10 +3755,13 @@ 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, @@ -3771,9 +3774,17 @@ 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);