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mktime: fix EOVERFLOW bug

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[BZ#23789]
* time/mktime.c [!_LIBC && !DEBUG_MKTIME]:
Include libc-config.h, not config.h, for __set_errno.
(guess_time_tm, __mktime_internal): Set errno to EOVERFLOW on overflow.
This commit is contained in:
Paul Eggert 2018-11-15 22:59:33 +01:00 committed by Albert ARIBAUD (3ADEV)
parent 8c6c3fb0bc
commit de20b81a03
2 changed files with 27 additions and 7 deletions
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8
ChangeLog
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@ -1,3 +1,11 @@
2018-11-15 Paul Eggert <eggert@cs.ucla.edu>
mktime: fix EOVERFLOW bug
[BZ#23789]
* time/mktime.c [!_LIBC && !DEBUG_MKTIME]:
Include libc-config.h, not config.h, for __set_errno.
(guess_time_tm, __mktime_internal): Set errno to EOVERFLOW on overflow.
2018-11-14 Samuel Thibault <samuel.thibault@ens-lyon.org>
* sysdeps/mach/hurd/dl-sysdep.c (check_no_hidden): Use

24
time/mktime.c
View File

@ -39,7 +39,7 @@
*/
#if !defined _LIBC && !DEBUG_MKTIME
# include <config.h>
# include <libc-config.h>
#endif
/* Assume that leap seconds are possible, unless told otherwise.
@ -51,6 +51,7 @@
#include <time.h>
#include <errno.h>
#include <limits.h>
#include <stdbool.h>
#include <stdlib.h>
@ -255,8 +256,9 @@ long_int_avg (long_int a, long_int b)
If TP is null, return a value not equal to T; this avoids false matches.
YEAR and YDAY must not be so large that multiplying them by three times the
number of seconds in a year (or day, respectively) would overflow long_int.
If the returned value would be out of range, yield the minimal or
maximal in-range value, except do not yield a value equal to T. */
If TP is non-null and the returned value would be out of range, set
errno to EOVERFLOW and yield a minimal or maximal in-range value
that is not equal to T. */
static long_int
guess_time_tm (long_int year, long_int yday, int hour, int min, int sec,
long_int t, const struct tm *tp)
@ -269,9 +271,10 @@ guess_time_tm (long_int year, long_int yday, int hour, int min, int sec,
tp->tm_hour, tp->tm_min, tp->tm_sec);
if (! INT_ADD_WRAPV (t, d, &result))
return result;
__set_errno (EOVERFLOW);
}
/* Overflow occurred one way or another. Return the nearest result
/* An error occurred, probably overflow. Return the nearest result
that is actually in range, except don't report a zero difference
if the actual difference is nonzero, as that would cause a false
match; and don't oscillate between two values, as that would
@ -344,6 +347,8 @@ ranged_convert (struct tm *(*convert) (const time_t *, struct tm *),
Use *OFFSET to keep track of a guess at the offset of the result,
compared to what the result would be for UTC without leap seconds.
If *OFFSET's guess is correct, only one CONVERT call is needed.
If successful, set *TP to the canonicalized struct tm;
otherwise leave *TP alone, return ((time_t) -1) and set errno.
This function is external because it is used also by timegm.c. */
time_t
__mktime_internal (struct tm *tp,
@ -435,7 +440,10 @@ __mktime_internal (struct tm *tp,
useful than returning -1. */
goto offset_found;
else if (--remaining_probes == 0)
{
__set_errno (EOVERFLOW);
return -1;
}
/* We have a match. Check whether tm.tm_isdst has the requested
value, if any. */
@ -505,8 +513,12 @@ __mktime_internal (struct tm *tp,
sec_adjustment -= sec;
sec_adjustment += sec_requested;
if (INT_ADD_WRAPV (t, sec_adjustment, &t)
|| ! (mktime_min <= t && t <= mktime_max)
|| ! convert_time (convert, t, &tm))
|| ! (mktime_min <= t && t <= mktime_max))
{
__set_errno (EOVERFLOW);
return -1;
}
if (! convert_time (convert, t, &tm))
return -1;
}