resolve use of VLA in JWT encoder function

This commit is contained in:
Rick Watson 2019-06-02 23:31:00 +01:00
parent 9c680e8826
commit bfa94b79d1

View File

@ -102,17 +102,21 @@ String ArduinoJsonJWT::encode(const char *cstr, int inputLen) {
base64_init_encodestate(&_state);
size_t encodedLength = base64_encode_expected_len(inputLen) + 1;
#endif
// prepare buffer of correct length
char buffer[encodedLength];
// prepare buffer of correct length, returning an empty string on failure
char* buffer = (char*) malloc(encodedLength * sizeof(char));
if (buffer == nullptr) {
return "";
}
// encode to buffer
int len = base64_encode_block(cstr, inputLen, &buffer[0], &_state);
len += base64_encode_blockend(&buffer[len], &_state);
buffer[len] = 0;
// convert to arduino string
// convert to arduino string, freeing buffer
String value = String(buffer);
free(buffer);
buffer=nullptr;
// remove padding and convert to URL safe form
while (value.length() > 0 && value.charAt(value.length() - 1) == '='){