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From "Ivan Popov (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-4163) [drlvm][jvmti] GetLocalVariableTable() crashes due to misprint in Method::get_local_var_entry()
Date Thu, 14 Jun 2007 13:06:27 GMT
[drlvm][jvmti] GetLocalVariableTable() crashes due to misprint in Method::get_local_var_entry()

                 Key: HARMONY-4163
                 URL: https://issues.apache.org/jira/browse/HARMONY-4163
             Project: Harmony
          Issue Type: Bug
          Components: DRLVM
         Environment: Windows/x86, harmony-jdk-r547139
            Reporter: Ivan Popov

Some failures of EUT tests (org.eclipse.jdt.core.tests.eval.DebugEvaluationTests) described
in HARMONY-3282 are because of DRLVM crashes in JVMTI function GetLocalVariableTable(). Quick
investigation revealed that the problem is in misprint in implementation of the function Method::get_local_var_entry()
(file vmcore\src\class_support\Class_File_Loader.cpp line 1240):

bool Method::get_local_var_entry(unsigned index, jlong* pc,
                         jint* length, jint* slot, String** name,
                         String** type, String** generic_type) {

    if (_line_number_table && index < _local_vars_table->length) {
        *pc = _local_vars_table->table[index].start_pc;
        *length = _local_vars_table->table[index].length;
        *slot = _local_vars_table->table[index].index;
        *name = _local_vars_table->table[index].name;
        *type = _local_vars_table->table[index].type;
        *generic_type = _local_vars_table->table[index].generic_type;
        return true;
    } else {
        return false;

In the first line this function incorrectly uses '_line_number_table' instead of '_local_vars_table'.

In this particular case '_line_number_table' is NULL and function does not set any data and
returns false. However, calling function jvmtiGetLocalVariableTable() does not check returned
result and uses uninitialized data (file jvmti_method.cpp, line 436):

jvmtiError JNICALL
jvmtiGetLocalVariableTable(jvmtiEnv* env,
                           jmethodID method,
                           jint* entry_count_ptr,
                           jvmtiLocalVariableEntry** table_ptr)
    for( index = 0; index < count; index++)
        String *name, *type, *generic_type;
        jvmtiLocalVariableEntry* entry = *table_ptr + index;
            &name, &type, &generic_type);  // <--- does not check for false
        // allocate memory for name
        len = get_utf8_length_of_8bit( (const uint8*)name->bytes, name->len);
        result = _allocate( len + 1, (unsigned char**)&pointer );
        if( result != JVMTI_ERROR_NONE ) {
            return result;

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