linux-kernel - [PATCH] crypto: aspeed: add error handling if dmam_alloc

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Date:   Thu, 23 Feb 2023 16:58:30 +0800
From:   Neal Liu <neal_liu@...eedtech.com>
To:     Joel Stanley <joel@....id.au>, Andrew Jeffery <andrew@...id.au>,
        Neal Liu <neal_liu@...eedtech.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S . Miller" <davem@...emloft.net>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-aspeed@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>,
        <linux-crypto@...r.kernel.org>
Subject: [PATCH] crypto: aspeed: add error handling if dmam_alloc_coherent() failed

Since the acry_dev->buf_addr may be NULL, add error handling to
prevent any additional access to avoid potential issues.

Signed-off-by: Neal Liu <neal_liu@...eedtech.com>
---
 drivers/crypto/aspeed/aspeed-acry.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/crypto/aspeed/aspeed-acry.c b/drivers/crypto/aspeed/aspeed-acry.c
index 1f77ebd73489..85733e418c9e 100644
--- a/drivers/crypto/aspeed/aspeed-acry.c
+++ b/drivers/crypto/aspeed/aspeed-acry.c
@@ -782,6 +782,11 @@ static int aspeed_acry_probe(struct platform_device *pdev)
 	acry_dev->buf_addr = dmam_alloc_coherent(dev, ASPEED_ACRY_BUFF_SIZE,
 						 &acry_dev->buf_dma_addr,
 						 GFP_KERNEL);
+	if (!acry_dev->buf_addr) {
+		rc = -ENOMEM;
+		goto err_engine_rsa_start;
+	}
+
 	memzero_explicit(acry_dev->buf_addr, ASPEED_ACRY_BUFF_SIZE);
 
 	aspeed_acry_register(acry_dev);
-- 
2.25.1