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device property: Fix reading pset strings using array access functions

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The length field value of non-array string properties is the length of the
string itself. Non-array string properties thus require specific handling.
Fix this.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Sakari Ailus 2017-03-28 15:22:18 +03:00 committed by Rafael J. Wysocki
parent 026b821745
commit 0f194992c8
1 changed files with 25 additions and 7 deletions
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32
drivers/base/property.c
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@ -147,14 +147,36 @@ static int pset_prop_read_string_array(struct property_set *pset,
const char *propname,
const char **strings, size_t nval)
{
const struct property_entry *prop;
const void *pointer;
size_t length = nval * sizeof(*strings);
size_t array_len, length;
/* Find out the array length. */
prop = pset_prop_get(pset, propname);
if (!prop)
return -EINVAL;
if (!prop->is_array)
/* The array length for a non-array string property is 1. */
array_len = 1;
else
/* Find the length of an array. */
array_len = pset_prop_count_elems_of_size(pset, propname,
sizeof(const char *));
/* Return how many there are if strings is NULL. */
if (!strings)
return array_len;
array_len = min(nval, array_len);
length = array_len * sizeof(*strings);
pointer = pset_prop_find(pset, propname, length);
if (IS_ERR(pointer))
return PTR_ERR(pointer);
memcpy(strings, pointer, length);
return 0;
}
@ -555,12 +577,8 @@ static int __fwnode_property_read_string_array(struct fwnode_handle *fwnode,
return acpi_node_prop_read(fwnode, propname, DEV_PROP_STRING,
val, nval);
else if (is_pset_node(fwnode))
return val ?
pset_prop_read_string_array(to_pset_node(fwnode),
propname, val, nval) :
pset_prop_count_elems_of_size(to_pset_node(fwnode),
propname,
sizeof(const char *));
return pset_prop_read_string_array(to_pset_node(fwnode),
propname, val, nval);
return -ENXIO;
}