[PATCH 1/2] lib/string_helpers: Introduce strsplit_u32()

[Cezary Rojewski]

On 2022-07-07 3:51 PM, Péter Ujfalusi wrote:
> On 07/07/2022 12:13, Cezary Rojewski wrote:

...

>> +int strsplit_u32(const char *str, const char *delim, u32 **tkns, size_t *num_tkns)
>> +{
>> +	size_t max_count = 32;
>> +	size_t count = 0;
>> +	char *s, **p;
>> +	u32 *buf, *tmp;
>> +	int ret = 0;
>> +
>> +	p = (char **)&str;
>> +	*tkns = NULL;
>> +	*num_tkns = 0;
>> +
>> +	buf = kcalloc(max_count, sizeof(*buf), GFP_KERNEL);
>> +	if (!buf)
>> +		return -ENOMEM;
>> +
>> +	while ((s = strsep(p, delim)) != NULL) {
>> +		ret = kstrtouint(s, 0, buf + count);
>> +		if (ret)
>> +			goto free_buf;
>> +
>> +		if (++count > max_count) {
> 
> I think this should be as it was originally:
> if (++count >= max_count) {
> 
> Otherwise when we reach the max_count we would not realloc to get more
> space and the data + max_count is pointing outside of the allocated area.

I believe you're right. Will change in v2.


Regards,
Czarek