linux-kernel - [PATCH] regmap: debugfs: Fix a erroneous check after snprintf()

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Message-Id: <8595de2462c490561f70020a6d11f4d6b652b468.1693857825.git.christophe.jaillet@wanadoo.fr>
Date:   Mon,  4 Sep 2023 22:04:06 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Mark Brown <broonie@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Dimitris Papastamos <dp@...nsource.wolfsonmicro.com>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Mark Brown <broonie@...nsource.wolfsonmicro.com>
Subject: [PATCH] regmap: debugfs: Fix a erroneous check after snprintf()

This error handling looks really strange.
Check if the string has been truncated instead.

Fixes: f0c2319f9f19 ("regmap: Expose the driver name in debugfs")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 drivers/base/regmap/regmap-debugfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/base/regmap/regmap-debugfs.c b/drivers/base/regmap/regmap-debugfs.c
index f36027591e1a..bdd80b73c3e6 100644
--- a/drivers/base/regmap/regmap-debugfs.c
+++ b/drivers/base/regmap/regmap-debugfs.c
@@ -48,7 +48,7 @@ static ssize_t regmap_name_read_file(struct file *file,
 		name = map->dev->driver->name;
 
 	ret = snprintf(buf, PAGE_SIZE, "%s\n", name);
-	if (ret < 0) {
+	if (ret >= PAGE_SIZE) {
 		kfree(buf);
 		return ret;
 	}
-- 
2.34.1