linux-kernel - [PATCH] regmap: dev_get_regmap_match(): fix string comparison

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Date:   Fri,  3 Jul 2020 12:33:15 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     linux-kernel@...r.kernel.org
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Mark Brown <broonie@...nel.org>,
        Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH] regmap: dev_get_regmap_match(): fix string comparison

This function is used by dev_get_regmap() to retrieve a regmap for the
specified device. If the device has more than one regmap, the name parameter
can be used to specify one.

The code here uses a pointer comparison to check for equal strings. This
however will probably always fail, as the regmap->name is allocated via
kstrdup_const() from the regmap's config->name.

Fix this by using strcmp() instead.

Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
Hey,

I stumbled over this by accident. AFAICS there's no-one on the kernel making
use of the "name" parameter.

regrads,
Marc

 drivers/base/regmap/regmap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 06a796821e8b..795a62a04022 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -1364,7 +1364,7 @@ static int dev_get_regmap_match(struct device *dev, void *res, void *data)

 	/* If the user didn't specify a name match any */
 	if (data)
-		return (*r)->name == data;
+		return !strcmp((*r)->name, data);
 	else
 		return 1;
 }
-- 
2.27.0