diff options
Diffstat (limited to 'py/parsenum.c')
| -rw-r--r-- | py/parsenum.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/py/parsenum.c b/py/parsenum.c index 8bd5232eb..ba7e40afd 100644 --- a/py/parsenum.c +++ b/py/parsenum.c @@ -234,7 +234,12 @@ mp_obj_t mp_parse_num_decimal(const char *str, size_t len, bool allow_imag, bool if ('0' <= dig && dig <= '9') { dig -= '0'; if (in == PARSE_DEC_IN_EXP) { - exp_val = 10 * exp_val + dig; + // don't overflow exp_val when adding next digit, instead just truncate + // it and the resulting float will still be correct, either inf or 0.0 + // (use INT_MAX/2 to allow adding exp_extra at the end without overflow) + if (exp_val < (INT_MAX / 2 - 9) / 10) { + exp_val = 10 * exp_val + dig; + } } else { if (dec_val < DEC_VAL_MAX) { // dec_val won't overflow so keep accumulating |