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device property: avoid allocations of 0 length

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Arrays can not have zero elements by definition of the unified device
properties. If such property comes from outside we should not allow it to pass.
Otherwise memory allocation on 0 length will return non-NULL value, which we
currently don't check.

Prevent memory allocations of 0 length.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Andy Shevchenko 2015-12-29 13:07:50 +02:00 committed by Rafael J. Wysocki
parent 0fb5902f2f
commit f6740c1899
1 changed files with 6 additions and 0 deletions
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6
drivers/base/property.c
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@ -653,6 +653,9 @@ int fwnode_property_match_string(struct fwnode_handle *fwnode,
if (nval < 0)
return nval;
if (nval == 0)
return -ENODATA;
values = kcalloc(nval, sizeof(*values), GFP_KERNEL);
if (!values)
return -ENOMEM;
@ -718,6 +721,9 @@ static int pset_copy_entry(struct property_entry *dst,
return -ENOMEM;
if (src->is_array) {
if (!src->length)
return -ENODATA;
if (src->is_string) {
nval = src->length / sizeof(const char *);
dst->pointer.str = kcalloc(nval, sizeof(const char *),