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date: do not allow "month #20" and such, closes 11356

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function                                             old     new   delta
parse_datestr                                        906     961     +55

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2018-09-23 20:27:32 +02:00
parent 6608879d34
commit 76832ff5c4
1 changed files with 14 additions and 0 deletions
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14
libbb/time.c
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@ -184,6 +184,7 @@ void FAST_FUNC parse_datestr(const char *date_str, struct tm *ptm)
ptm->tm_year -= 1900; /* Adjust years */
ptm->tm_mon -= 1; /* Adjust month from 1-12 to 0-11 */
} else {
err:
bb_error_msg_and_die(bb_msg_invalid_date, date_str);
}
ptm->tm_sec = 0; /* assume zero if [.SS] is not given */
@ -194,6 +195,19 @@ void FAST_FUNC parse_datestr(const char *date_str, struct tm *ptm)
end = '\0';
/* else end != NUL and we error out */
}
/* Users were confused by "date -s 20180923"
* working (not in the way they were expecting).
* It was interpreted as MMDDhhmm, and not bothered by
* "month #20" in the least. Prevent such cases:
*/
if (ptm->tm_sec > 60 /* allow "23:60" leap second */
|| ptm->tm_min > 59
|| ptm->tm_hour > 23
|| ptm->tm_mday > 31
|| ptm->tm_mon > 11 /* month# is 0..11, not 1..12 */
) {
goto err;
}
}
if (end != '\0') {
bb_error_msg_and_die(bb_msg_invalid_date, date_str);