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Fixed rare crash when accessing library import by name 

The library name index may only be 8-bits.

This bug was not present in the previous implementation due to a bitmask
(0xFF) - see
ea99ba8e3b/src/xenia/kernel/util/xex2.cc (L272)
This commit is contained in:
x1nixmzeng 2016-01-09 01:19:05 +00:00
parent 16c97189dd
commit 7e4fdf7669
3 changed files with 9 additions and 5 deletions
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6
src/xenia/cpu/xex_module.cc
View File

@ -260,10 +260,12 @@ bool XexModule::Load(const std::string& name, const std::string& path,
auto libraries_ptr = reinterpret_cast<uint8_t*>(opt_import_header) +
opt_import_header->string_table_size + 12;
uint32_t library_offset = 0;
for (uint32_t i = 0; i < opt_import_header->library_count; i++) {
uint32_t library_count = opt_import_header->library_count;
for (uint32_t i = 0; i < library_count; i++) {
auto library =
reinterpret_cast<xex2_import_library*>(libraries_ptr + library_offset);
SetupLibraryImports(string_table[library->name_index], library);
SetupLibraryImports(string_table[library->name_index % library_count],
library);
library_offset += library->size;
}

5
src/xenia/kernel/user_module.cc
View File

@ -475,10 +475,11 @@ void UserModule::Dump() {
reinterpret_cast<const uint8_t*>(opt_import_libraries) +
opt_import_libraries->string_table_size + 12;
uint32_t library_offset = 0;
for (uint32_t l = 0; l < opt_import_libraries->library_count; l++) {
uint32_t library_count = opt_import_libraries->library_count;
for (uint32_t l = 0; l < library_count; l++) {
auto library = reinterpret_cast<const xex2_import_library*>(
libraries + library_offset);
auto name = string_table[library->name_index];
auto name = string_table[library->name_index % library_count];
sb.AppendFormat(" %s - %d imports\n", name,
(uint16_t)library->count);

3
src/xenia/kernel/util/xex2.cc
View File

@ -285,7 +285,8 @@ int xe_xex2_read_header(const uint8_t* addr, const size_t length,
library->version.value = src_library->version.value;
library->min_version.value = src_library->version_min.value;
std::strncpy(library->name, string_table[src_library->name_index],
std::strncpy(library->name,
string_table[src_library->name_index % count],
xe::countof(library->name));
library->record_count = src_library->count;