linux-kernel - [PATCH v4 3/4] regmap: Add raw_write/read checks for max_raw

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Message-Id: <1440920036-17517-4-git-send-email-mpa@pengutronix.de>
Date:	Sun, 30 Aug 2015 09:33:55 +0200
From:	Markus Pargmann <mpa@...gutronix.de>
To:	Mark Brown <broonie@...nel.org>
Cc:	Wolfram Sang <wsa@...-dreams.de>, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, kernel@...gutronix.de,
	Irina Tirdea <irina.tirdea@...el.com>,
	Markus Pargmann <mpa@...gutronix.de>
Subject: [PATCH v4 3/4] regmap: Add raw_write/read checks for max_raw_write/read sizes

Check in regmap_raw_read() and regmap_raw_write() for correct maximum
sizes of the operations. Return -E2BIG if this size is not supported
because it is too big.

Also this patch causes an uninitialized variable warning so it
initializes ret (although not necessary).

Signed-off-by: Markus Pargmann <mpa@...gutronix.de>
---
 drivers/base/regmap/regmap.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index fc8084033982..650d3b12f373 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -1569,6 +1569,8 @@ int regmap_raw_write(struct regmap *map, unsigned int reg,
 		return -EINVAL;
 	if (val_len % map->format.val_bytes)
 		return -EINVAL;
+	if (map->max_raw_write && map->max_raw_write > val_len)
+		return -E2BIG;
 
 	map->lock(map->lock_arg);
 
@@ -2294,6 +2296,10 @@ int regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
 			ret = -ENOTSUPP;
 			goto out;
 		}
+		if (map->max_raw_read && map->max_raw_read < val_len) {
+			ret = -E2BIG;
+			goto out;
+		}
 
 		/* Physical block read if there's no cache involved */
 		ret = _regmap_raw_read(map, reg, val, val_len);
-- 
2.5.0

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