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std: Fix metadata corruption in HeapAllocator

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HeapAllocator stores the pointer returned by HeapAlloc right after the
data block and, after the recent allocator refactoring, the space for
this pointer was not taken into account in the calculation of the final
block size.

Fixes #5830
This commit is contained in:
LemonBoy 2020-09-20 00:10:53 +02:00 committed by Andrew Kelley
parent f92d01c8a8
commit 58ee5f4e61
1 changed files with 1 additions and 1 deletions
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lib/std/heap.zig
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@ -489,7 +489,7 @@ pub const HeapAllocator = switch (builtin.os.tag) {
const full_len = os.windows.kernel32.HeapSize(heap_handle, 0, ptr);
assert(full_len != std.math.maxInt(usize));
assert(full_len >= amt);
break :init mem.alignBackwardAnyAlign(full_len - (aligned_addr - root_addr), len_align);
break :init mem.alignBackwardAnyAlign(full_len - (aligned_addr - root_addr) - @sizeOf(usize), len_align);
};
const buf = @intToPtr([*]u8, aligned_addr)[0..return_len];
getRecordPtr(buf).* = root_addr;