Jeff King <peff@xxxxxxxx> writes:
> If an ident line has a ridiculous date value like (2^64)+1,
> we currently just pass ULONG_MAX along to the date code,
> which can produce nonsensical dates.
>
> On systems with a signed long time_t (e.g., 64-bit glibc
> systems), this actually doesn't end up too bad. The
> ULONG_MAX is converted to -1, we apply the timezone field to
> that, and the result ends up somewhere between Dec 31, 1969
> and Jan 1, 1970.
> ...
> We also recognize overflow in the timezone field, which
> could produce nonsensical results. In this case we show the
> parsed date, but in UTC.
Both are good measures to fallback to sanity, but why is that
if/else? In other words...
> + if (date_overflows(date))
> + date = 0;
> + else {
> + if (ident->tz_begin && ident->tz_end)
> + tz = strtol(ident->tz_begin, NULL, 10);
> + if (tz == LONG_MAX || tz == LONG_MIN)
> + tz = 0;
> + }
... don't we want to fix an input having a bogus timestamp and also
a bogus tz recorded in it?
> return show_date(date, tz, mode);
> }
>
> diff --git a/t/t4212-log-corrupt.sh b/t/t4212-log-corrupt.sh
> index 83de981..ba25a2e 100755
> --- a/t/t4212-log-corrupt.sh
> +++ b/t/t4212-log-corrupt.sh
> @@ -65,4 +65,20 @@ test_expect_success 'unparsable dates produce sentinel value (%ad)' '
> test_cmp expect actual
> '
>
> +# date is 2^64 + 1
> +test_expect_success 'date parser recognizes integer overflow' '
> + commit=$(munge_author_date HEAD 18446744073709551617) &&
> + echo "Thu Jan 1 00:00:00 1970 +0000" >expect &&
> + git log -1 --format=%ad $commit >actual &&
> + test_cmp expect actual
> +'
> +
> +# date is 2^64 - 2
> +test_expect_success 'date parser recognizes time_t overflow' '
> + commit=$(munge_author_date HEAD 18446744073709551614) &&
> + echo "Thu Jan 1 00:00:00 1970 +0000" >expect &&
> + git log -1 --format=%ad $commit >actual &&
> + test_cmp expect actual
> +'
> +
> test_done
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