[PATCH AUTOSEL 5.12 33/80] crypto: qce: skcipher: Fix incorrect sg count for dma transfers
From: Sasha Levin <sashal@kernel.org>
Date: 2021-07-04 23:12:41
Also in:
linux-arm-msm, linux-crypto, lkml
Subsystem:
crypto api, qualcomm crypto drivers, the rest · Maintainers:
Herbert Xu, "David S. Miller", Bartosz Golaszewski, Linus Torvalds
From: Thara Gopinath <redacted> [ Upstream commit 1339a7c3ba05137a2d2fe75f602311bbfc6fab33 ] Use the sg count returned by dma_map_sg to call into dmaengine_prep_slave_sg rather than using the original sg count. dma_map_sg can merge consecutive sglist entries, thus making the original sg count wrong. This is a fix for memory coruption issues observed while testing encryption/decryption of large messages using libkcapi framework. Patch has been tested further by running full suite of tcrypt.ko tests including fuzz tests. Signed-off-by: Thara Gopinath <redacted> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Sasha Levin <sashal@kernel.org> --- drivers/crypto/qce/skcipher.c | 15 ++++++++------- 1 file changed, 8 insertions(+), 7 deletions(-)
diff --git a/drivers/crypto/qce/skcipher.c b/drivers/crypto/qce/skcipher.c
index a2d3da0ad95f..5a6559131eac 100644
--- a/drivers/crypto/qce/skcipher.c
+++ b/drivers/crypto/qce/skcipher.c@@ -71,7 +71,7 @@ qce_skcipher_async_req_handle(struct crypto_async_request *async_req) struct scatterlist *sg; bool diff_dst; gfp_t gfp; - int ret; + int dst_nents, src_nents, ret; rctx->iv = req->iv; rctx->ivsize = crypto_skcipher_ivsize(skcipher);
@@ -122,21 +122,22 @@ qce_skcipher_async_req_handle(struct crypto_async_request *async_req) sg_mark_end(sg); rctx->dst_sg = rctx->dst_tbl.sgl; - ret = dma_map_sg(qce->dev, rctx->dst_sg, rctx->dst_nents, dir_dst); - if (ret < 0) + dst_nents = dma_map_sg(qce->dev, rctx->dst_sg, rctx->dst_nents, dir_dst); + if (dst_nents < 0) goto error_free; if (diff_dst) { - ret = dma_map_sg(qce->dev, req->src, rctx->src_nents, dir_src); - if (ret < 0) + src_nents = dma_map_sg(qce->dev, req->src, rctx->src_nents, dir_src); + if (src_nents < 0) goto error_unmap_dst; rctx->src_sg = req->src; } else { rctx->src_sg = rctx->dst_sg; + src_nents = dst_nents - 1; } - ret = qce_dma_prep_sgs(&qce->dma, rctx->src_sg, rctx->src_nents, - rctx->dst_sg, rctx->dst_nents, + ret = qce_dma_prep_sgs(&qce->dma, rctx->src_sg, src_nents, + rctx->dst_sg, dst_nents, qce_skcipher_done, async_req); if (ret) goto error_unmap_src;
--
2.30.2