linux-kernel - [PATCH v1 1/5] devres: Introduce devm_kmemdup

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Message-Id: <20241123200527.7830-2-raag.jadav@intel.com>
Date: Sun, 24 Nov 2024 01:35:23 +0530
From: Raag Jadav <raag.jadav@...el.com>
To: gregkh@...uxfoundation.org,
	linus.walleij@...aro.org,
	mika.westerberg@...ux.intel.com,
	andriy.shevchenko@...ux.intel.com,
	dmitry.torokhov@...il.com,
	broonie@...nel.org,
	pierre-louis.bossart@...ux.dev
Cc: linux-gpio@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-input@...r.kernel.org,
	linux-sound@...r.kernel.org,
	Raag Jadav <raag.jadav@...el.com>
Subject: [PATCH v1 1/5] devres: Introduce devm_kmemdup_array()

Introduce '_array' variant of devm_kmemdup() for the users which lack
multiplication overflow check.

Suggested-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Signed-off-by: Raag Jadav <raag.jadav@...el.com>
---
 include/linux/device.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/linux/device.h b/include/linux/device.h
index b4bde8d22697..c31f48d0dde0 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -358,6 +358,16 @@ char *devm_kstrdup(struct device *dev, const char *s, gfp_t gfp) __malloc;
 const char *devm_kstrdup_const(struct device *dev, const char *s, gfp_t gfp);
 void *devm_kmemdup(struct device *dev, const void *src, size_t len, gfp_t gfp)
 	__realloc_size(3);
+static inline void *devm_kmemdup_array(struct device *dev, const void *src,
+				       size_t n, size_t size, gfp_t flags)
+{
+	size_t bytes;
+
+	if (unlikely(check_mul_overflow(n, size, &bytes)))
+		return NULL;
+
+	return devm_kmemdup(dev, src, bytes, flags);
+}
 
 unsigned long devm_get_free_pages(struct device *dev,
 				  gfp_t gfp_mask, unsigned int order);
-- 
2.35.3