Fix out of bound read in libziparchive am: d9fd1863f4 am: 6908996434 am: 25c0d68d29 am: ed33065bfc am: bc8c8e4b56 am: afddaba0cc am: 0b1ad23070 am: d4b4f0a1e1
am: 2aea56db64
Change-Id: Icecc6630e82f43360d55b925a5946ffd0d608f58
diff --git a/libziparchive/zip_archive.cc b/libziparchive/zip_archive.cc
index 246575f..f321535 100644
--- a/libziparchive/zip_archive.cc
+++ b/libziparchive/zip_archive.cc
@@ -381,6 +381,14 @@
const uint8_t* const cd_end = cd_ptr + cd_length;
const uint8_t* ptr = cd_ptr;
for (uint16_t i = 0; i < num_entries; i++) {
+ if (ptr > cd_end - sizeof(CentralDirectoryRecord)) {
+ ALOGW("Zip: ran off the end (at %" PRIu16 ")", i);
+#if defined(__ANDROID__)
+ android_errorWriteLog(0x534e4554, "36392138");
+#endif
+ return -1;
+ }
+
const CentralDirectoryRecord* cdr =
reinterpret_cast<const CentralDirectoryRecord*>(ptr);
if (cdr->record_signature != CentralDirectoryRecord::kSignature) {
@@ -388,11 +396,6 @@
return -1;
}
- if (ptr + sizeof(CentralDirectoryRecord) > cd_end) {
- ALOGW("Zip: ran off the end (at %" PRIu16 ")", i);
- return -1;
- }
-
const off64_t local_header_offset = cdr->local_file_header_offset;
if (local_header_offset >= archive->directory_offset) {
ALOGW("Zip: bad LFH offset %" PRId64 " at entry %" PRIu16,