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

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

houqp commented on a change in pull request #7480:
URL: https://github.com/apache/arrow/pull/7480#discussion_r442475621



##########
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:
       good catch, would be good to add a test for this.




----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.

For queries about this service, please contact Infrastructure at:
users@infra.apache.org