[GitHub] [arrow] paddyhoran commented on a change in pull request #7480: ARROW-9176: [Rust] Fix for memory leaks in Arrow allocator

[GitBox <gi...@apache.org>]

paddyhoran commented on a change in pull request #7480:
URL: https://github.com/apache/arrow/pull/7480#discussion_r443242626



##########
File path: rust/arrow/src/memory.rs
##########
@@ -150,25 +150,32 @@ pub fn allocate_aligned(size: usize) -> *mut u8 {
 }
 
 pub unsafe fn free_aligned(ptr: *mut u8, size: usize) {
-    if size != 0x00 && ptr != BYPASS_PTR.as_ptr() {
+    if ptr != BYPASS_PTR.as_ptr() {
         std::alloc::dealloc(ptr, Layout::from_size_align_unchecked(size, ALIGNMENT));
     }
 }
 
 pub unsafe fn reallocate(ptr: *mut u8, old_size: usize, new_size: usize) -> *mut u8 {
     if ptr == BYPASS_PTR.as_ptr() {
-        allocate_aligned(new_size)
-    } else {
-        let new_ptr = std::alloc::realloc(
-            ptr,
-            Layout::from_size_align_unchecked(old_size, ALIGNMENT),
-            new_size,
-        );
-        if !new_ptr.is_null() && new_size > old_size {
-            new_ptr.add(old_size).write_bytes(0, new_size - old_size);
-        }
-        new_ptr
+        return allocate_aligned(new_size);
+    }
+
+    if new_size == 0 {
+        free_aligned(ptr, old_size);
+        return BYPASS_PTR.as_ptr();

Review comment:
       I guess we could start running valgrind in CI for Rust?  I don't use Valgrind but I created an [issue](https://issues.apache.org/jira/browse/ARROW-9200) if anyone wants to pick it up.




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