linux-kernel - [PATCH] zram: use strscpy() is more robust and safer

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Date:   Mon, 19 Sep 2022 02:50:14 +0000
From:   cgel.zte@...il.com
To:     minchan@...nel.org
Cc:     ngupta@...are.org, senozhatsky@...omium.org, axboe@...nel.dk,
        linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        Minghao Chi <chi.minghao@....com.cn>,
        Zeal Robot <zealci@....com.cn>
Subject: [PATCH] zram: use strscpy() is more robust and safer

From: Minghao Chi <chi.minghao@....com.cn>

The implementation of strscpy() is more robust and safer.

That's now the recommended way to copy NUL terminated strings.

Reported-by: Zeal Robot <zealci@....com.cn>
Signed-off-by: Minghao Chi <chi.minghao@....com.cn>
---
 drivers/block/zram/zram_drv.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index eb021db21ddf..28b17c82c27a 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -499,7 +499,7 @@ static ssize_t backing_dev_store(struct device *dev,
 		goto out;
 	}
 
-	strlcpy(file_name, buf, PATH_MAX);
+	strscpy(file_name, buf, PATH_MAX);
 	/* ignore trailing newline */
 	sz = strlen(file_name);
 	if (sz > 0 && file_name[sz - 1] == '\n')
@@ -1031,7 +1031,7 @@ static ssize_t comp_algorithm_store(struct device *dev,
 	char compressor[ARRAY_SIZE(zram->compressor)];
 	size_t sz;
 
-	strlcpy(compressor, buf, sizeof(compressor));
+	strscpy(compressor, buf, sizeof(compressor));
 	/* ignore trailing newline */
 	sz = strlen(compressor);
 	if (sz > 0 && compressor[sz - 1] == '\n')
@@ -1979,7 +1979,7 @@ static int zram_add(void)
 	if (ret)
 		goto out_cleanup_disk;
 
-	strlcpy(zram->compressor, default_compressor, sizeof(zram->compressor));
+	strscpy(zram->compressor, default_compressor, sizeof(zram->compressor));
 
 	zram_debugfs_register(zram);
 	pr_info("Added device: %s\n", zram->disk->disk_name);
-- 
2.25.1