linux-kernel - [PATCH 20/35] crypto: ccree: do not copy zero size MLLI table

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Message-Id: <20190418133913.9122-21-gilad@benyossef.com>
Date:   Thu, 18 Apr 2019 16:38:55 +0300
From:   Gilad Ben-Yossef <gilad@...yossef.com>
To:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>
Cc:     Ofir Drang <ofir.drang@....com>, linux-crypto@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 20/35] crypto: ccree: do not copy zero size MLLI table

When we are given a 0 sized cryptlen and assoclen in
a scatterlist with two entries we were falsely trying to
create a zero length MLLI table, causing the HW to choke.
Don't try to copy a zero sized MLLI table.

Signed-off-by: Gilad Ben-Yossef <gilad@...yossef.com>
---
 drivers/crypto/ccree/cc_aead.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/crypto/ccree/cc_aead.c b/drivers/crypto/ccree/cc_aead.c
index 0fa676b5603c..0e8d2381c175 100644
--- a/drivers/crypto/ccree/cc_aead.c
+++ b/drivers/crypto/ccree/cc_aead.c
@@ -1163,9 +1163,9 @@ static void cc_mlli_to_sram(struct aead_request *req,
 	struct cc_aead_ctx *ctx = crypto_aead_ctx(tfm);
 	struct device *dev = drvdata_to_dev(ctx->drvdata);
 
-	if (req_ctx->assoc_buff_type == CC_DMA_BUF_MLLI ||
+	if ((req_ctx->assoc_buff_type == CC_DMA_BUF_MLLI ||
 	    req_ctx->data_buff_type == CC_DMA_BUF_MLLI ||
-	    !req_ctx->is_single_pass) {
+	    !req_ctx->is_single_pass) && req_ctx->mlli_params.mlli_len) {
 		dev_dbg(dev, "Copy-to-sram: mlli_dma=%08x, mlli_size=%u\n",
 			(unsigned int)ctx->drvdata->mlli_sram_addr,
 			req_ctx->mlli_params.mlli_len);
-- 
2.21.0