[PATCH v4 3/4] regmap: Add raw_write/read checks for max_raw_write/read sizes
From: Markus Pargmann <hidden>
Date: 2015-08-30 07:34:10
Also in:
lkml
Subsystem:
driver core, kobjects, debugfs and sysfs, register map abstraction, the rest · Maintainers:
Greg Kroah-Hartman, "Rafael J. Wysocki", Danilo Krummrich, Mark Brown, Linus Torvalds
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 <redacted> --- 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