From: Eneas U de Queiroz cotequeiroz@gmail.com
[ Upstream commit d6364b8128439a8c0e381f80c38667de9f15eef8 ]
The qce crypto driver appends an extra entry to the dst sgl, to maintain private state information.
When the gcm driver sends requests to the ctr skcipher, it passes the authentication tag after the actual crypto payload, but it must not be touched.
Commit 1336c2221bee ("crypto: qce - save a sg table slot for result buf") limited the destination sgl to avoid overwriting the authentication tag but it assumed the tag would be in a separate sgl entry.
This is not always the case, so it is better to limit the length of the destination buffer to req->cryptlen before appending the result buf.
Signed-off-by: Eneas U de Queiroz cotequeiroz@gmail.com Signed-off-by: Herbert Xu herbert@gondor.apana.org.au Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/crypto/qce/dma.c | 11 ++++++----- drivers/crypto/qce/dma.h | 2 +- drivers/crypto/qce/skcipher.c | 5 +++-- 3 files changed, 10 insertions(+), 8 deletions(-)
diff --git a/drivers/crypto/qce/dma.c b/drivers/crypto/qce/dma.c index 7da893dc00e73..46db5bf366b44 100644 --- a/drivers/crypto/qce/dma.c +++ b/drivers/crypto/qce/dma.c @@ -48,9 +48,10 @@ void qce_dma_release(struct qce_dma_data *dma)
struct scatterlist * qce_sgtable_add(struct sg_table *sgt, struct scatterlist *new_sgl, - int max_ents) + unsigned int max_len) { struct scatterlist *sg = sgt->sgl, *sg_last = NULL; + unsigned int new_len;
while (sg) { if (!sg_page(sg)) @@ -61,13 +62,13 @@ qce_sgtable_add(struct sg_table *sgt, struct scatterlist *new_sgl, if (!sg) return ERR_PTR(-EINVAL);
- while (new_sgl && sg && max_ents) { - sg_set_page(sg, sg_page(new_sgl), new_sgl->length, - new_sgl->offset); + while (new_sgl && sg && max_len) { + new_len = new_sgl->length > max_len ? max_len : new_sgl->length; + sg_set_page(sg, sg_page(new_sgl), new_len, new_sgl->offset); sg_last = sg; sg = sg_next(sg); new_sgl = sg_next(new_sgl); - max_ents--; + max_len -= new_len; }
return sg_last; diff --git a/drivers/crypto/qce/dma.h b/drivers/crypto/qce/dma.h index ed25a0d9829e5..7864021693608 100644 --- a/drivers/crypto/qce/dma.h +++ b/drivers/crypto/qce/dma.h @@ -43,6 +43,6 @@ void qce_dma_issue_pending(struct qce_dma_data *dma); int qce_dma_terminate_all(struct qce_dma_data *dma); struct scatterlist * qce_sgtable_add(struct sg_table *sgt, struct scatterlist *sg_add, - int max_ents); + unsigned int max_len);
#endif /* _DMA_H_ */ diff --git a/drivers/crypto/qce/skcipher.c b/drivers/crypto/qce/skcipher.c index 4217b745f1242..63ae75809cb70 100644 --- a/drivers/crypto/qce/skcipher.c +++ b/drivers/crypto/qce/skcipher.c @@ -97,13 +97,14 @@ qce_skcipher_async_req_handle(struct crypto_async_request *async_req)
sg_init_one(&rctx->result_sg, qce->dma.result_buf, QCE_RESULT_BUF_SZ);
- sg = qce_sgtable_add(&rctx->dst_tbl, req->dst, rctx->dst_nents - 1); + sg = qce_sgtable_add(&rctx->dst_tbl, req->dst, req->cryptlen); if (IS_ERR(sg)) { ret = PTR_ERR(sg); goto error_free; }
- sg = qce_sgtable_add(&rctx->dst_tbl, &rctx->result_sg, 1); + sg = qce_sgtable_add(&rctx->dst_tbl, &rctx->result_sg, + QCE_RESULT_BUF_SZ); if (IS_ERR(sg)) { ret = PTR_ERR(sg); goto error_free;