Avoid recording backtrace if alloc-size is outside range of interest

Steps:
1) setprop libc.debug.malloc.program <program name>
2) setprop libc.debug.malloc.options "backtrace leak_track"
3) setprop libc.debug.malloc.minalloctorecord <int> # defaults to 0
4) setprop libc.debug.malloc.maxalloctorecord <int> # defaults to SIZE_MAX

With this, backtrace recording of only those allocations which fall within
the desired range will be done.

CRs-Fixed: 2471840

Change-Id: I586dfd590e429b53e7b1b237294f0298ff7b4017

1 files changed, 4 insertions, 1 deletions

diff --git a/libc/malloc_debug/PointerData.cpp b/libc/malloc_debug/PointerData.cpp
index 617d128c7..8cc1a2891 100644
--- a/libc/malloc_debug/PointerData.cpp
+++ b/libc/malloc_debug/PointerData.cpp
@@ -196,7 +196,10 @@ void PointerData::Add(const void* ptr, size_t pointer_size) {
   uintptr_t pointer = reinterpret_cast<uintptr_t>(ptr);
   size_t hash_index = 0;
   if (backtrace_enabled_) {
-    hash_index = AddBacktrace(g_debug->config().backtrace_frames());
+    if ((pointer_size >= g_min_alloc_to_record) &&
+        (pointer_size <= g_max_alloc_to_record)) {
+      hash_index = AddBacktrace(g_debug->config().backtrace_frames());
+    }
   }
 
   std::lock_guard<std::mutex> pointer_guard(pointer_mutex_);