From 8cfbc003fecfea3ce33c685fd7f21f70709fdd5b Mon Sep 17 00:00:00 2001
From: igerasim <none@none>
Date: Wed, 22 May 2019 19:41:59 -0700
Subject: [PATCH] 8222684: Better support for patterns 8223163: Better pattern
 recognition Reviewed-by: ahgross, bchristi, jeff, rhalade, rriggs, smarks

---
 src/share/classes/java/util/regex/Pattern.java | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/src/share/classes/java/util/regex/Pattern.java b/src/share/classes/java/util/regex/Pattern.java
index 009a46e6f..743439012 100644
--- a/src/share/classes/java/util/regex/Pattern.java
+++ b/src/share/classes/java/util/regex/Pattern.java
@@ -1348,7 +1348,11 @@ public final class Pattern
         localCount = 0;
 
         if (pattern.length() > 0) {
-            compile();
+            try {
+                compile();
+            } catch (StackOverflowError soe) {
+                throw error("Stack overflow during pattern compilation");
+            }
         } else {
             root = new Start(lastAccept);
             matchRoot = lastAccept;
@@ -1905,6 +1909,10 @@ loop:   for(int x=0, offset=0; x<nCodePoints; x++, offset+=len) {
         int ch = temp[cursor++];
         while (ch != 0 && !isLineSeparator(ch))
             ch = temp[cursor++];
+        if (ch == 0 && cursor > patternLength) {
+            cursor = patternLength;
+            ch = temp[cursor++];
+        }
         return ch;
     }
 
@@ -1915,6 +1923,10 @@ loop:   for(int x=0, offset=0; x<nCodePoints; x++, offset+=len) {
         int ch = temp[++cursor];
         while (ch != 0 && !isLineSeparator(ch))
             ch = temp[++cursor];
+        if (ch == 0 && cursor > patternLength) {
+            cursor = patternLength;
+            ch = temp[cursor];
+        }
         return ch;
     }
 
-- 
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