imgdiff: Fix an edge case that leads to infinite loop.
When the input image ends with the magic value sequence of 0x1f, 0x8b,
0x0b (optionally with 0x00), the image parsing code will be stuck in an
infinite loop.
Test: recovery_component_test passes.
Change-Id: Ie3629dfdc41360387b19cc3e0359c95ae4fb998e
diff --git a/tests/component/imgdiff_test.cpp b/tests/component/imgdiff_test.cpp
index 3711859..7ad3307 100644
--- a/tests/component/imgdiff_test.cpp
+++ b/tests/component/imgdiff_test.cpp
@@ -404,6 +404,86 @@
ASSERT_EQ(tgt, patched);
}
+TEST(ImgdiffTest, image_mode_short_input1) {
+ // src: "abcdefgh" + '0x1f8b0b'.
+ const std::vector<char> src_data = { 'a', 'b', 'c', 'd', 'e', 'f',
+ 'g', 'h', '\x1f', '\x8b', '\x08' };
+ const std::string src(src_data.cbegin(), src_data.cend());
+ TemporaryFile src_file;
+ ASSERT_TRUE(android::base::WriteStringToFile(src, src_file.path));
+
+ // tgt: "abcdefgxyz".
+ const std::vector<char> tgt_data = { 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'x', 'y', 'z' };
+ const std::string tgt(tgt_data.cbegin(), tgt_data.cend());
+ TemporaryFile tgt_file;
+ ASSERT_TRUE(android::base::WriteStringToFile(tgt, tgt_file.path));
+
+ TemporaryFile patch_file;
+ std::vector<const char*> args = {
+ "imgdiff", src_file.path, tgt_file.path, patch_file.path,
+ };
+ ASSERT_EQ(0, imgdiff(args.size(), args.data()));
+
+ // Verify.
+ std::string patch;
+ ASSERT_TRUE(android::base::ReadFileToString(patch_file.path, &patch));
+
+ // Expect one CHUNK_RAW (header) entry.
+ size_t num_normal;
+ size_t num_raw;
+ size_t num_deflate;
+ verify_patch_header(patch, &num_normal, &num_raw, &num_deflate);
+ ASSERT_EQ(0U, num_normal);
+ ASSERT_EQ(0U, num_deflate);
+ ASSERT_EQ(1U, num_raw);
+
+ std::string patched;
+ ASSERT_EQ(0, ApplyImagePatch(reinterpret_cast<const unsigned char*>(src.data()), src.size(),
+ reinterpret_cast<const unsigned char*>(patch.data()), patch.size(),
+ MemorySink, &patched));
+ ASSERT_EQ(tgt, patched);
+}
+
+TEST(ImgdiffTest, image_mode_short_input2) {
+ // src: "abcdefgh" + '0x1f8b0b00'.
+ const std::vector<char> src_data = { 'a', 'b', 'c', 'd', 'e', 'f',
+ 'g', 'h', '\x1f', '\x8b', '\x08', '\x00' };
+ const std::string src(src_data.cbegin(), src_data.cend());
+ TemporaryFile src_file;
+ ASSERT_TRUE(android::base::WriteStringToFile(src, src_file.path));
+
+ // tgt: "abcdefgxyz".
+ const std::vector<char> tgt_data = { 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'x', 'y', 'z' };
+ const std::string tgt(tgt_data.cbegin(), tgt_data.cend());
+ TemporaryFile tgt_file;
+ ASSERT_TRUE(android::base::WriteStringToFile(tgt, tgt_file.path));
+
+ TemporaryFile patch_file;
+ std::vector<const char*> args = {
+ "imgdiff", src_file.path, tgt_file.path, patch_file.path,
+ };
+ ASSERT_EQ(0, imgdiff(args.size(), args.data()));
+
+ // Verify.
+ std::string patch;
+ ASSERT_TRUE(android::base::ReadFileToString(patch_file.path, &patch));
+
+ // Expect one CHUNK_RAW (header) entry.
+ size_t num_normal;
+ size_t num_raw;
+ size_t num_deflate;
+ verify_patch_header(patch, &num_normal, &num_raw, &num_deflate);
+ ASSERT_EQ(0U, num_normal);
+ ASSERT_EQ(0U, num_deflate);
+ ASSERT_EQ(1U, num_raw);
+
+ std::string patched;
+ ASSERT_EQ(0, ApplyImagePatch(reinterpret_cast<const unsigned char*>(src.data()), src.size(),
+ reinterpret_cast<const unsigned char*>(patch.data()), patch.size(),
+ MemorySink, &patched));
+ ASSERT_EQ(tgt, patched);
+}
+
TEST(ImgdiffTest, image_mode_single_entry_long) {
// src: "abcdefgh" + '0x1f8b0b00' + some bytes.
const std::vector<char> src_data = { 'a', 'b', 'c', 'd', 'e', 'f', 'g',