Fix an overflow crash in DiscImageDevice::Verify

xenia-project · Jan 14, 2016 · e8719dd · e8719dd
1 parent 9473f20
commit e8719dd
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/src/xenia/vfs/devices/disc_image_device.cc b/src/xenia/vfs/devices/disc_image_device.cc
@@ -84,6 +84,10 @@ DiscImageDevice::Error DiscImageDevice::Verify(ParseState* state) {
 }
 
 bool DiscImageDevice::VerifyMagic(ParseState* state, size_t offset) {
+  if (offset >= state->size) {
+    return false;
+  }
+
   // Simple check to see if the given offset contains the magic value.
   return std::memcmp(state->ptr + offset, "MICROSOFT*XBOX*MEDIA", 20) == 0;
 }