linux-kernel - [PATCH 04/10] crypto: hisilicon/zip - replace 'sprintf' with 'scnprintf'

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Message-ID: <1595648683-50590-5-git-send-email-shenyang39@huawei.com>
Date:   Sat, 25 Jul 2020 11:44:37 +0800
From:   Yang Shen <shenyang39@...wei.com>
To:     <herbert@...dor.apana.org.au>, <davem@...emloft.net>
CC:     <linux-kernel@...r.kernel.org>, <linux-crypto@...r.kernel.org>,
        <xuzaibo@...wei.com>, <wangzhou1@...ilicon.com>
Subject: [PATCH 04/10] crypto: hisilicon/zip - replace 'sprintf' with 'scnprintf'

Replace 'sprintf' with 'scnprintf' to avoid overrun.

Signed-off-by: Yang Shen <shenyang39@...wei.com>
Reviewed-by: Zhou Wang <wangzhou1@...ilicon.com>
---
 drivers/crypto/hisilicon/zip/zip_main.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/crypto/hisilicon/zip/zip_main.c b/drivers/crypto/hisilicon/zip/zip_main.c
index df1a16f..1883d1b 100644
--- a/drivers/crypto/hisilicon/zip/zip_main.c
+++ b/drivers/crypto/hisilicon/zip/zip_main.c
@@ -428,7 +428,7 @@ static ssize_t hisi_zip_ctrl_debug_read(struct file *filp, char __user *buf,
 		return -EINVAL;
 	}
 	spin_unlock_irq(&file->lock);
-	ret = sprintf(tbuf, "%u\n", val);
+	ret = scnprintf(tbuf, HZIP_BUF_SIZE, "%u\n", val);
 	return simple_read_from_buffer(buf, count, pos, tbuf, ret);
 }

@@ -514,13 +514,16 @@ static int hisi_zip_core_debug_init(struct hisi_qm *qm)
 	struct debugfs_regset32 *regset;
 	struct dentry *tmp_d;
 	char buf[HZIP_BUF_SIZE];
-	int i;
+	int i, ret;

 	for (i = 0; i < HZIP_CORE_NUM; i++) {
 		if (i < HZIP_COMP_CORE_NUM)
-			sprintf(buf, "comp_core%d", i);
+			ret = scnprintf(buf, HZIP_BUF_SIZE, "comp_core%d", i);
 		else
-			sprintf(buf, "decomp_core%d", i - HZIP_COMP_CORE_NUM);
+			ret = scnprintf(buf, HZIP_BUF_SIZE, "decomp_core%d",
+					i - HZIP_COMP_CORE_NUM);
+		if (!ret)
+			return -ENOMEM;

 		regset = devm_kzalloc(dev, sizeof(*regset), GFP_KERNEL);
 		if (!regset)
--
2.7.4