Temporarily reverted patch for bug #41868 as it was causing problems in PB.

client/sql_string.cc

@@ -72,26 +72,26 @@ bool String::realloc(uint32 alloc_length)
     if (alloced)
     {
       if ((new_ptr= (char*) my_realloc(Ptr,len,MYF(MY_WME))))
-        new_ptr[alloc_length]= 0;
+      {
+	Ptr=new_ptr;
+	Alloced_length=len;
+      }
       else
 	return TRUE;				// Signal error
     }
     else if ((new_ptr= (char*) my_malloc(len,MYF(MY_WME))))
     {
-      if (str_length > len - 1)
-        str_length= 0;
       if (str_length)				// Avoid bugs in memcpy on AIX
-        memcpy(new_ptr, Ptr, str_length);
-      new_ptr[str_length]= 0;
+	memcpy(new_ptr,Ptr,str_length);
+      new_ptr[str_length]=0;
+      Ptr=new_ptr;
+      Alloced_length=len;
       alloced=1;
     }
     else
       return TRUE;			// Signal error
-    Ptr= new_ptr;
-    Alloced_length= len;
   }
-  else
-    Ptr[alloc_length]= 0;
+  Ptr[alloc_length]=0;			// This make other funcs shorter
   return FALSE;
 }
 

mysql-test/r/func_str.result

@@ -2181,10 +2181,4 @@ def					format(a, 2)	253	20	4	Y	0	2	8
 format(a, 2)
 1.33
 drop table t1;
-CREATE TABLE t1 (c DATE, aa VARCHAR(30));
-INSERT INTO t1 VALUES ('2008-12-31','aaaaaa');
-SELECT DATE_FORMAT(c, GET_FORMAT(DATE, 'eur')) h, CONCAT(UPPER(aa),', ', aa) i FROM t1;
-h	i
-31.12.2008	AAAAAA, aaaaaa
-DROP TABLE t1;
 End of 5.0 tests

mysql-test/t/func_str.test

@@ -1159,13 +1159,4 @@ select format(a, 2) from t1;
 --disable_metadata
 drop table t1;
 
-#
-# Bug #41868: crash or memory overrun with concat + upper, date_format functions
-#
-
-CREATE TABLE t1 (c DATE, aa VARCHAR(30));
-INSERT INTO t1 VALUES ('2008-12-31','aaaaaa');
-SELECT DATE_FORMAT(c, GET_FORMAT(DATE, 'eur')) h, CONCAT(UPPER(aa),', ', aa) i FROM t1;
-DROP TABLE t1;
-
 --echo End of 5.0 tests

sql/sql_class.cc

@@ -1047,11 +1047,6 @@ bool select_send::send_data(List<Item> &items)
       my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));
       break;
     }
-    /*
-      Reset buffer to its original state, as it may have been altered in
-      Item::send().
-    */
-    buffer.set(buff, sizeof(buff), &my_charset_bin);
   }
   thd->sent_row_count++;
   if (!thd->vio_ok())

sql/sql_string.cc

@@ -72,26 +72,26 @@ bool String::realloc(uint32 alloc_length)
     if (alloced)
     {
       if ((new_ptr= (char*) my_realloc(Ptr,len,MYF(MY_WME))))
-        new_ptr[alloc_length]= 0;
+      {
+	Ptr=new_ptr;
+	Alloced_length=len;
+      }
       else
 	return TRUE;				// Signal error
     }
     else if ((new_ptr= (char*) my_malloc(len,MYF(MY_WME))))
     {
-      if (str_length > len - 1)
-        str_length= 0;
       if (str_length)				// Avoid bugs in memcpy on AIX
-        memcpy(new_ptr, Ptr, str_length);
-      new_ptr[str_length]= 0;
+	memcpy(new_ptr,Ptr,str_length);
+      new_ptr[str_length]=0;
+      Ptr=new_ptr;
+      Alloced_length=len;
       alloced=1;
     }
     else
       return TRUE;			// Signal error
-    Ptr= new_ptr;
-    Alloced_length= len;
   }
-  else
-    Ptr[alloc_length]= 0;
+  Ptr[alloc_length]=0;			// This make other funcs shorter
   return FALSE;
 }