From: Ayush Sawal <ayush.sawal@chelsio.com>
Date: Wed, 5 Feb 2020 10:48:42 +0530
Subject: crypto: chelsio - This fixes the kernel panic which occurs during a
 libkcapi test
Patch-mainline: v5.7-rc1
Git-commit: 9195189e00a7db55e7d448cee973cae87c5a3c71
References: jsc#SLE-15129

The libkcapi test which causes kernel panic is
aead asynchronous vmsplice multiple test.

./bin/kcapi  -v -d 4 -x 10   -c "ccm(aes)"
-q 4edb58e8d5eb6bc711c43a6f3693daebde2e5524f1b55297abb29f003236e43d
-t a7877c99 -n 674742abd0f5ba -k 2861fd0253705d7875c95ba8a53171b4
-a fb7bc304a3909e66e2e0c5ef952712dd884ce3e7324171369f2c5db1adc48c7d

This patch avoids dma_mapping of a zero length sg which causes the panic,
by using sg_nents_for_len which maps only upto a specific length

Signed-off-by: Ayush Sawal <ayush.sawal@chelsio.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/crypto/chelsio/chcr_algo.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/crypto/chelsio/chcr_algo.c
+++ b/drivers/crypto/chelsio/chcr_algo.c
@@ -2500,8 +2500,9 @@ int chcr_aead_dma_map(struct device *dev
 	else
 		reqctx->b0_dma = 0;
 	if (req->src == req->dst) {
-		error = dma_map_sg(dev, req->src, sg_nents(req->src),
-				   DMA_BIDIRECTIONAL);
+		error = dma_map_sg(dev, req->src,
+				sg_nents_for_len(req->src, dst_size),
+					DMA_BIDIRECTIONAL);
 		if (!error)
 			goto err;
 	} else {