Return error directly when uncompressed length is 0
If uncompressed length is 0, in function MemMap::MapAnonymous, it will generate a MemMap instance whose base_begin is nullptr.
Then, when OpenMemory, it will create a DexFile instance.
At DexFile::DexFile constructor, header_ is asigned to 0, then header_->string_ids_off_ will cause crash.
Bug: b/28856653
Test: test-art-host-gtest-dex_file_test
Signed-off-by: ganxiaolin <ganxiaolin@xiaomi.com>
Change-Id: Id37f7629f4646cbc385ef054cb83b15be4c59b00
diff --git a/runtime/dex_file_test.cc b/runtime/dex_file_test.cc
index 616c2a0..2704d8a 100644
--- a/runtime/dex_file_test.cc
+++ b/runtime/dex_file_test.cc
@@ -166,6 +166,12 @@
"uAAAAAYAAAABAAAA0AAAAAEgAAACAAAA8AAAAAEQAAABAAAAHAEAAAIgAAAIAAAAIgEAAAMgAAAC"
"AAAAcwEAAAAgAAABAAAAfgEAAAAQAAABAAAAjAEAAA==";
+static const char kRawDexZeroLength[] =
+ "UEsDBAoAAAAAAOhxAkkAAAAAAAAAAAAAAAALABwAY2xhc3Nlcy5kZXhVVAkAA2QNoVdnDaFXdXgL"
+ "AAEE5AMBAASIEwAAUEsBAh4DCgAAAAAA6HECSQAAAAAAAAAAAAAAAAsAGAAAAAAAAAAAAKCBAAAA"
+ "AGNsYXNzZXMuZGV4VVQFAANkDaFXdXgLAAEE5AMBAASIEwAAUEsFBgAAAAABAAEAUQAAAEUAAAAA"
+ "AA==";
+
static void DecodeAndWriteDexFile(const char* base64, const char* location) {
// decode base64
CHECK(base64 != nullptr);
@@ -254,6 +260,18 @@
ASSERT_FALSE(DexFile::Open(location, location, kVerifyChecksum, &error_msg, &dex_files));
}
+TEST_F(DexFileTest, ZeroLengthDexRejected) {
+ ScratchFile tmp;
+ const char* location = tmp.GetFilename().c_str();
+ DecodeAndWriteDexFile(kRawDexZeroLength, location);
+
+ ScopedObjectAccess soa(Thread::Current());
+ static constexpr bool kVerifyChecksum = true;
+ std::string error_msg;
+ std::vector<std::unique_ptr<const DexFile>> dex_files;
+ ASSERT_FALSE(DexFile::Open(location, location, kVerifyChecksum, &error_msg, &dex_files));
+}
+
TEST_F(DexFileTest, GetLocationChecksum) {
ScopedObjectAccess soa(Thread::Current());
std::unique_ptr<const DexFile> raw(OpenTestDexFile("Main"));