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This patch is based on the upstream commit described below, minus a hunk
that was later reverted by upstream.
commit d8d6a7d096d3aaafd963b356a8f1bbd8d26fd967
Author: A. Molzer <5550310+197g@users.noreply.github.com>
Date: Fri Jul 11 00:23:18 2025 +0200
Fix uninitialized Cell at unsync::Bump::new
diff --git a/static-alloc/src/unsync/bump.rs b/static-alloc/src/unsync/bump.rs
index 0bd0def7b8..23171e73d8 100644
--- static-alloc/src/unsync/bump.rs
+++ static-alloc/src/unsync/bump.rs
@@ -129,6 +129,7 @@ impl MemBump {
let ptr = NonNull::new(unsafe { alloc::alloc::alloc(layout) })
.unwrap_or_else(|| alloc::alloc::handle_alloc_error(layout));
let ptr = ptr::slice_from_raw_parts_mut(ptr.as_ptr(), capacity);
+ unsafe { ptr::write(ptr as *mut Cell<usize>, Cell::new(0)) };
unsafe { alloc::boxed::Box::from_raw(ptr as *mut MemBump) }
}
}
@@ -502,7 +500,7 @@ impl MemBump {
let requested = layout.size();
// Ensure no overflows when calculating offets within.
- assert!(expect_consumed <= length);
+ assert!(expect_consumed <= length, "{}/{}", expect_consumed, length);
let available = length.checked_sub(expect_consumed).unwrap();
let ptr_to = base_ptr.wrapping_add(expect_consumed);
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