[PATCH v4 3/4] regmap: Add raw_write/read checks for max_raw_write/read sizes

From: Markus Pargmann
Date: Sun Aug 30 2015 - 03:34:45 EST


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@xxxxxxxxxxxxxx>
---
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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