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fix hangs in localtime for near-overflowing time_t values on 64-bit archs

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This commit is contained in:
Rich Felker 2013-12-19 05:05:13 -05:00
commit f89e298290
1 changed files with 6 additions and 0 deletions
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6
src/time/localtime_r.c
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@ -4,6 +4,12 @@
struct tm *__localtime_r(const time_t *restrict t, struct tm *restrict tm) struct tm *__localtime_r(const time_t *restrict t, struct tm *restrict tm)
{ {
/* Reject time_t values whose year would overflow int because
* __secs_to_zone cannot safely handle them. */
if (*t < INT_MIN * 31622400LL || *t > INT_MAX * 31622400LL) {
errno = EOVERFLOW;
return 0;
}
__secs_to_zone(*t, 0, &tm->tm_isdst, &tm->__tm_gmtoff, 0, &tm->__tm_zone); __secs_to_zone(*t, 0, &tm->tm_isdst, &tm->__tm_gmtoff, 0, &tm->__tm_zone);
if (__secs_to_tm((long long)*t - tm->__tm_gmtoff, tm) < 0) { if (__secs_to_tm((long long)*t - tm->__tm_gmtoff, tm) < 0) {
errno = EOVERFLOW; errno = EOVERFLOW;