[PATCH] crypto: allwinner: sun8i-ce: fix error return code in sun8i_ce_prng_generate()

[Jia-Ju Bai]

When dma_mapping_error() returns an error, no error return code of 
sun8i_ce_prng_generate() is assigned.
To fix this bug, err is assigned with -EFAULT as error return code.

Reported-by: TOTE Robot <os...@tsinghua.edu.cn>
Signed-off-by: Jia-Ju Bai <baijiaju1...@gmail.com>
---
 drivers/crypto/allwinner/sun8i-ce/sun8i-ce-prng.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-prng.c 
b/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-prng.c
index cfde9ee4356b..cd1baee424a1 100644
--- a/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-prng.c
+++ b/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-prng.c
@@ -99,6 +99,7 @@ int sun8i_ce_prng_generate(struct crypto_rng *tfm, const u8 
*src,
        dma_iv = dma_map_single(ce->dev, ctx->seed, ctx->slen, DMA_TO_DEVICE);
        if (dma_mapping_error(ce->dev, dma_iv)) {
                dev_err(ce->dev, "Cannot DMA MAP IV\n");
+               err = -EFAULT;
                goto err_iv;
        }
 
-- 
2.17.1