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From 027471cf1095f75f273df40310e4647fe1e8a9df Mon Sep 17 00:00:00 2001
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From: Tony Cook <tony@develop-help.com>
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Date: Wed, 20 Mar 2019 16:47:49 +1100
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Subject: [PATCH] (perl #133913) limit numeric format results to INT_MAX
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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The return value of v?snprintf() is int, and we pay attention to that
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return value, so limit the expected size of numeric formats to
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INT_MAX.
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Signed-off-by: Petr Písař <ppisar@redhat.com>
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---
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pod/perldiag.pod | 6 ++++++
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sv.c | 7 +++++++
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t/op/sprintf2.t | 7 +++++++
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3 files changed, 20 insertions(+)
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diff --git a/pod/perldiag.pod b/pod/perldiag.pod
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index 1037215d44..166d29b4bb 100644
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--- a/pod/perldiag.pod
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+++ b/pod/perldiag.pod
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@@ -4354,6 +4354,12 @@ the meantime, try using scientific notation (e.g. "1e6" instead of
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a number. This happens, for example with C<\o{}>, with no number between
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the braces.
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+=item Numeric format result too large
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+
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+(F) The length of the result of a numeric format supplied to sprintf()
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+or printf() would have been too large for the underlying C function to
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+report. This limit is typically 2GB.
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+
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=item Octal number > 037777777777 non-portable
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(W portable) The octal number you specified is larger than 2**32-1
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diff --git a/sv.c b/sv.c
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index 8fbca52eb2..8bc0af0c16 100644
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--- a/sv.c
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+++ b/sv.c
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@@ -13085,6 +13085,13 @@ Perl_sv_vcatpvfn_flags(pTHX_ SV *const sv, const char *const pat, const STRLEN p
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if (float_need < width)
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float_need = width;
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+ if (float_need > INT_MAX) {
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+ /* snprintf() returns an int, and we use that return value,
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+ so die horribly if the expected size is too large for int
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+ */
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+ Perl_croak(aTHX_ "Numeric format result too large");
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+ }
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+
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if (PL_efloatsize <= float_need) {
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/* PL_efloatbuf should be at least 1 greater than
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* float_need to allow a trailing \0 to be returned by
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diff --git a/t/op/sprintf2.t b/t/op/sprintf2.t
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index 84259a4afd..5fee8efede 100644
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--- a/t/op/sprintf2.t
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+++ b/t/op/sprintf2.t
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@@ -1153,4 +1153,11 @@ foreach(
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is sprintf("%.0f", $_), sprintf("%-.0f", $_), "special-case %.0f on $_";
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}
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+# large uvsize needed so the large width is parsed properly
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+# large sizesize needed so the STRLEN check doesn't
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+if ($Config{intsize} == 4 && $Config{uvsize} > 4 && $Config{sizesize} > 4) {
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+ eval { my $x = sprintf("%7000000000E", 0) };
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+ like($@, qr/^Numeric format result too large at /,
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+ "croak for very large numeric format results");
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+}
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done_testing();
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--
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2.20.1
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