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From:   Tero Kristo <t-kristo@ti.com>
To:     <herbert@gondor.apana.org.au>, <davem@davemloft.net>,
        <linux-crypto@vger.kernel.org>
CC:     <linux-omap@vger.kernel.org>
Subject: [PATCH 5/6] crypto: omap-sham: fix very small data size handling
Date:   Wed, 29 Apr 2020 17:42:04 +0300
Message-ID: <20200429144205.5291-6-t-kristo@ti.com>
In-Reply-To: <20200429144205.5291-1-t-kristo@ti.com>
References: <20200429144205.5291-1-t-kristo@ti.com>
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Sender: linux-crypto-owner@vger.kernel.org
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With very small data sizes, the whole data can end up in the xmit
buffer. This code path does not set the sg_len properly which causes the
core dma framework to crash. Fix by adding the proper size in place.
Also, the data length must be a multiple of block-size, so extend the
DMA data size while here.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
---
 drivers/crypto/omap-sham.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/crypto/omap-sham.c b/drivers/crypto/omap-sham.c
index 9823d7dfca9c..86949f1ac6a7 100644
--- a/drivers/crypto/omap-sham.c
+++ b/drivers/crypto/omap-sham.c
@@ -753,9 +753,11 @@ static int omap_sham_align_sgs(struct scatterlist *sg,
 
 	if (!sg || !sg->length || !nbytes) {
 		if (bufcnt) {
+			bufcnt = DIV_ROUND_UP(bufcnt, bs) * bs;
 			sg_init_table(rctx->sgl, 1);
 			sg_set_buf(rctx->sgl, rctx->dd->xmit_buf, bufcnt);
 			rctx->sg = rctx->sgl;
+			rctx->sg_len = 1;
 		}
 
 		return 0;
-- 
2.17.1

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