Commit d02242661e

Andrew Kelley <andrew@ziglang.org>
2022-10-31 03:28:26
std.heap: make wasm32 PageAllocator handle large allocation
When a number of bytes to be allocated is so great that alignForward() is not possible, return `error.OutOfMemory`. Companion commit to 3f3003097cbf5a6ad9e0dfc29b2cafbe2e35dded.
master
1 parent ef761c2
Changed files (1)
lib
std
heap.zig
lib/std/heap.zig
@@ -523,6 +523,9 @@ const WasmPageAllocator = struct {
 
     fn alloc(_: *anyopaque, len: usize, alignment: u29, len_align: u29, ra: usize) error{OutOfMemory}![]u8 {
         _ = ra;
+        if (len > maxInt(usize) - (mem.page_size - 1)) {
+            return error.OutOfMemory;
+        }
         const page_count = nPages(len);
         const page_idx = try allocPages(page_count, alignment);
         return @intToPtr([*]u8, page_idx * mem.page_size)[0..alignPageAllocLen(page_count * mem.page_size, len, len_align)];