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tzcode: Fix overflow handling in TZ parser.

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Obtained from:	upstream 9fc11a27
MFC after:	1 week
PR:		276281
This commit is contained in:
Dag-Erling Smørgrav 2024-02-18 10:48:08 +01:00
parent 078a31136c
commit 1365bb722a
1 changed files with 3 additions and 1 deletions
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4
contrib/tzcode/localtime.c
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@ -1246,11 +1246,13 @@ tzparse(const char *name, struct state *sp, struct state const *basep)
do {
int_fast32_t yearsecs
= year_lengths[isleap(yearbeg - 1)] * SECSPERDAY;
time_t janfirst1 = janfirst;
yearbeg--;
if (increment_overflow_time(&janfirst, -yearsecs)) {
if (increment_overflow_time(&janfirst1, -yearsecs)) {
janoffset = -yearsecs;
break;
}
janfirst = janfirst1;
} while (atlo < janfirst
&& EPOCH_YEAR - YEARSPERREPEAT / 2 < yearbeg);