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loader/nso: Check if read succeeded in IdentifyFile() before checking magic value

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We should always assume the filesystem is volatile and check each IO
operation. While we're at it reorganize checks so that early-out errors
are near one another.
This commit is contained in:
Lioncash 2018-07-19 12:40:06 -04:00
parent 758c357868
commit 9b22f856c2
1 changed files with 7 additions and 5 deletions
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12
src/core/loader/nso.cpp
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@ -55,13 +55,15 @@ AppLoader_NSO::AppLoader_NSO(FileSys::VirtualFile file) : AppLoader(std::move(fi
FileType AppLoader_NSO::IdentifyType(const FileSys::VirtualFile& file) { FileType AppLoader_NSO::IdentifyType(const FileSys::VirtualFile& file) {
u32 magic = 0; u32 magic = 0;
file->ReadObject(&magic); if (file->ReadObject(&magic) != sizeof(magic)) {
return FileType::Error;
if (Common::MakeMagic('N', 'S', 'O', '0') == magic) {
return FileType::NSO;
} }
return FileType::Error; if (Common::MakeMagic('N', 'S', 'O', '0') != magic) {
return FileType::Error;
}
return FileType::NSO;
} }
static std::vector<u8> DecompressSegment(const std::vector<u8>& compressed_data, static std::vector<u8> DecompressSegment(const std::vector<u8>& compressed_data,