From eb23c6008753b1cdc5359dead3a096dce46c9018 Mon Sep 17 00:00:00 2001
From: "Christoph M. Becker" <cmbecker69@gmx.de>
Date: Sat, 30 Nov 2019 12:26:37 +0100
Subject: Fix #78878: Buffer underflow in bc_shift_addsub

We must not rely on `isdigit()` to detect digits, since we only support
decimal ASCII digits in the following processing.
---
 ext/bcmath/tests/bug78878.phpt | 13 +++++++++++++
 1 file changed, 13 insertions(+)
 create mode 100644 ext/bcmath/tests/bug78878.phpt

(limited to 'ext/bcmath/tests')

diff --git a/ext/bcmath/tests/bug78878.phpt b/ext/bcmath/tests/bug78878.phpt
new file mode 100644
index 0000000000..2c9d72b946
--- /dev/null
+++ b/ext/bcmath/tests/bug78878.phpt
@@ -0,0 +1,13 @@
+--TEST--
+Bug #78878 (Buffer underflow in bc_shift_addsub)
+--SKIPIF--
+<?php
+if (!extension_loaded('bcmath')) die('skip bcmath extension not available');
+?>
+--FILE--
+<?php
+print @bcmul("\xB26483605105519922841849335928742092", bcpowmod(2, 65535, -4e-4));
+?>
+--EXPECT--
+bc math warning: non-zero scale in modulus
+0
-- 
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