[trace][intelpt] Fix out-of-bounds access.

The StringRef single argument constructor expects a null-terminated
string.  Explicitly pass the size to prevent reading pass the end
of the array.

diff --git a/lldb/source/Plugins/Process/Linux/Procfs.cpp b/lldb/source/Plugins/Process/Linux/Procfs.cpp
index 1ff7c56..756749e 100644 (file)
--- a/lldb/source/Plugins/Process/Linux/Procfs.cpp
+++ b/lldb/source/Plugins/Process/Linux/Procfs.cpp
@@ -60,8 +60,8 @@ lldb_private::process_linux::GetAvailableLogicalCoreIDs() {
     if (!cpuinfo)
       return cpuinfo.takeError();
 
-    Expected<std::vector<int>> core_ids = GetAvailableLogicalCoreIDs(
-        StringRef(reinterpret_cast<const char *>(cpuinfo->data())));
+    Expected<std::vector<int>> core_ids = GetAvailableLogicalCoreIDs(StringRef(
+        reinterpret_cast<const char *>(cpuinfo->data()), cpuinfo->size()));
     if (!core_ids)
       return core_ids.takeError();