linux-kernel - [PATCH v1 1/3] regmap: trace: Remove useless check for NULL for bulk ops

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Message-Id: <20220901132336.33234-1-andriy.shevchenko@linux.intel.com>
Date:   Thu,  1 Sep 2022 16:23:34 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Dmitry Rokosov <DDRokosov@...rdevices.ru>,
        linux-kernel@...r.kernel.org
Cc:     Mark Brown <broonie@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>
Subject: [PATCH v1 1/3] regmap: trace: Remove useless check for NULL for bulk ops

If the buffer pointer is NULL we already are in troubles since
regmap bulk API expects caller to provide valid parameters,
it dereferences that without any checks before we call for
traces.

Moreover, the current code will print garbage in the case of
buffer is NULL and length is not 0.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/base/regmap/trace.h | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/base/regmap/trace.h b/drivers/base/regmap/trace.h
index 04329ba68ec5..e92edc4f4ca5 100644
--- a/drivers/base/regmap/trace.h
+++ b/drivers/base/regmap/trace.h
@@ -82,8 +82,7 @@ DECLARE_EVENT_CLASS(regmap_bulk,
 		__assign_str(name, regmap_name(map));
 		__entry->reg = reg;
 		__entry->val_len = val_len;
-		if (val)
-			memcpy(__get_dynamic_array(buf), val, val_len);
+		memcpy(__get_dynamic_array(buf), val, val_len);
 	),
 
 	TP_printk("%s reg=%x val=%s", __get_str(name),
-- 
2.35.1