From 99645e5be59145bcab2fe36aefde4224e6e69961 Mon Sep 17 00:00:00 2001
From: Neeraj Bisht <neeraj.x.bisht@oracle.com>
Date: Mon, 14 Jan 2013 14:59:48 +0530
Subject: BUG#14303860 - EXECUTING A SELECT QUERY WITH TOO MANY WILDCARDS
 CAUSES A SEGFAULT

Back port from 5.6 and trunk
---
 strings/ctype-mb.c | 50 +++++++++++++++++++++++++++++++++++++++-----------
 1 file changed, 39 insertions(+), 11 deletions(-)

(limited to 'strings/ctype-mb.c')

diff --git a/strings/ctype-mb.c b/strings/ctype-mb.c
index 76dae6762af..92d7b5f48c8 100644
--- a/strings/ctype-mb.c
+++ b/strings/ctype-mb.c
@@ -148,13 +148,16 @@ int my_strcasecmp_mb(CHARSET_INFO * cs,const char *s, const char *t)
 
 #define likeconv(s,A) (uchar) (s)->sort_order[(uchar) (A)]
 
-int my_wildcmp_mb(CHARSET_INFO *cs,
-		  const char *str,const char *str_end,
-		  const char *wildstr,const char *wildend,
-		  int escape, int w_one, int w_many)
+static
+int my_wildcmp_mb_impl(CHARSET_INFO *cs,
+                       const char *str,const char *str_end,
+                       const char *wildstr,const char *wildend,
+                       int escape, int w_one, int w_many, int recurse_level)
 {
   int result= -1;				/* Not found, using wildcards */
 
+  if (my_string_stack_guard && my_string_stack_guard(recurse_level))
+    return 1;
   while (wildstr != wildend)
   {
     while (*wildstr != w_many && *wildstr != w_one)
@@ -243,8 +246,8 @@ int my_wildcmp_mb(CHARSET_INFO *cs,
           INC_PTR(cs,str, str_end);
         }
 	{
-	  int tmp=my_wildcmp_mb(cs,str,str_end,wildstr,wildend,escape,w_one,
-                                w_many);
+	  int tmp=my_wildcmp_mb_impl(cs,str,str_end,wildstr,wildend,escape,w_one,
+                                     w_many, recurse_level + 1);
 	  if (tmp <= 0)
 	    return (tmp);
 	}
@@ -255,6 +258,16 @@ int my_wildcmp_mb(CHARSET_INFO *cs,
   return (str != str_end ? 1 : 0);
 }
 
+int my_wildcmp_mb(CHARSET_INFO *cs,
+                  const char *str,const char *str_end,
+                  const char *wildstr,const char *wildend,
+                  int escape, int w_one, int w_many)
+{
+  return my_wildcmp_mb_impl(cs, str, str_end,
+                            wildstr, wildend,
+                            escape, w_one, w_many, 1);
+}
+
 
 size_t my_numchars_mb(CHARSET_INFO *cs __attribute__((unused)),
 		      const char *pos, const char *end)
@@ -697,13 +710,15 @@ fill_max_and_min:
 }
 
 
-static int my_wildcmp_mb_bin(CHARSET_INFO *cs,
-		  const char *str,const char *str_end,
-		  const char *wildstr,const char *wildend,
-		  int escape, int w_one, int w_many)
+static int my_wildcmp_mb_bin_impl(CHARSET_INFO *cs,
+                                  const char *str,const char *str_end,
+                                  const char *wildstr,const char *wildend,
+                                  int escape, int w_one, int w_many, int recurse_level)
 {
   int result= -1;				/* Not found, using wildcards */
 
+  if (my_string_stack_guard && my_string_stack_guard(recurse_level))
+    return 1;
   while (wildstr != wildend)
   {
     while (*wildstr != w_many && *wildstr != w_one)
@@ -790,7 +805,9 @@ static int my_wildcmp_mb_bin(CHARSET_INFO *cs,
           INC_PTR(cs,str, str_end);
         }
 	{
-	  int tmp=my_wildcmp_mb_bin(cs,str,str_end,wildstr,wildend,escape,w_one,w_many);
+	  int tmp=my_wildcmp_mb_bin_impl(cs,str,str_end,
+                                         wildstr,wildend,escape,
+                                         w_one,w_many, recurse_level+1);
 	  if (tmp <= 0)
 	    return (tmp);
 	}
@@ -801,6 +818,17 @@ static int my_wildcmp_mb_bin(CHARSET_INFO *cs,
   return (str != str_end ? 1 : 0);
 }
 
+int
+my_wildcmp_mb_bin(CHARSET_INFO *cs,
+                  const char *str,const char *str_end,
+                  const char *wildstr,const char *wildend,
+                  int escape, int w_one, int w_many)
+{
+  return my_wildcmp_mb_bin_impl(cs, str, str_end,
+                                wildstr, wildend,
+                                escape, w_one, w_many, 1);
+}
+
 
 /*
   Data was produced from EastAsianWidth.txt 
-- 
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