Initial commit — leak-hunt project complete

Five bugs identified and patched in retail Asheron's Call client:
- v3b: palette refcount over-increment (3-byte NOP at two sites)
- v5: RenderSurface PurgeResource no-op stub (vtable slot 2 thunk)
- v11: two dangling-pointer crash guards (NULL-check + reorder)
- v14: CEnvCell::Destroy ClipPlaneList leak (18-byte JMP to cleanup thunk)
- v22: unpacker stale-pointer SEH guard (whole-function __try/__except)

All five ship in leakfix.dll (117 KB, SHA d282f23c…) which is loaded
by acclient.exe at process start via PE import table patching by
tools/install_leakfix.py.

Controlled 15-client fleet soak: unpatched control died at 26h with
palette exhaustion; all 14 patched clients survived past that point
and reached ≥5-day uptime.

Residual ~15 MB/h growth traced to d3d9.dll's internal slab allocator
(260KB surface backing buffers retained after Release). See REPORT.md
§10 for the full investigation; conclusion is that it's unfixable from
outside d3d9.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tools/patch_v7_test.py

@@ -0,0 +1,149 @@
+"""patch_v7_test.py <pid> [--revert]
+
+EXPERIMENTAL v7: NOP BOTH guards in UIElement_ItemList::UpdateEmptySlots
+to force the trim logic to run regardless of:
+  1. visibility    (jz at 0x004e439d — same NOP as v6)
+  2. auto-fit mode (jne at 0x004e43bd — NEW for v7)
+
+Function prologue (EoR):
+  0x004e4390:  sub esp, 0x10
+  0x004e4393:  push esi
+  0x004e4394:  mov esi, ecx               ; this = ecx
+  0x004e4396:  call IsVisible
+  0x004e439b:  test al, al
+  0x004e439d:  jz  +0x1f3                 ; <-- NOP (v6/v7 site 1)
+  0x004e43a3:  push ebx
+  0x004e43a4:  push ebp
+  0x004e43a5:  push edi
+  0x004e43a6:  lea eax, [esp+0x14]
+  0x004e43aa:  push eax
+  0x004e43ab:  push 0x10000015
+  0x004e43b0:  mov ecx, esi
+  0x004e43b2:  call GetAttribute_Int
+  0x004e43b7:  mov eax, [esp+0x14]
+  0x004e43bb:  or  edi, -1                ; edi = 0xFFFFFFFF (= -1)
+  0x004e43be:  cmp eax, edi
+  0x004e43bd:  jne +0x1cd                 ; <-- NOP (v7 site 2)
+  ...
+
+After v7 both guards are eliminated. The function runs unconditionally.
+The trim loop inside then runs and deletes WAITING-state items at the
+end of the array.
+"""
+import argparse
+import ctypes
+import ctypes.wintypes as wt
+import sys
+
+
+SITE_VIS_VA   = 0x004e439d
+SITE_VIS_ORIG = bytes([0x0f, 0x84, 0xf3, 0x01, 0x00, 0x00])   # jz +0x1f3
+SITE_VIS_NOP  = bytes([0x90] * 6)
+
+SITE_AF_VA    = 0x004e43c0
+SITE_AF_ORIG  = bytes([0x0f, 0x85, 0xcd, 0x01, 0x00, 0x00])   # jne +0x1cd
+SITE_AF_NOP   = bytes([0x90] * 6)
+
+
+PROCESS_VM_READ           = 0x0010
+PROCESS_VM_WRITE          = 0x0020
+PROCESS_VM_OPERATION      = 0x0008
+PROCESS_QUERY_INFORMATION = 0x0400
+PAGE_EXECUTE_READWRITE    = 0x40
+
+
+k32 = ctypes.windll.kernel32
+OpenProcess        = k32.OpenProcess
+OpenProcess.argtypes = [wt.DWORD, wt.BOOL, wt.DWORD]; OpenProcess.restype = wt.HANDLE
+CloseHandle        = k32.CloseHandle
+CloseHandle.argtypes = [wt.HANDLE]; CloseHandle.restype = wt.BOOL
+WriteProcessMemory = k32.WriteProcessMemory
+WriteProcessMemory.argtypes = [wt.HANDLE, wt.LPVOID, wt.LPCVOID, ctypes.c_size_t,
+                               ctypes.POINTER(ctypes.c_size_t)]
+WriteProcessMemory.restype = wt.BOOL
+ReadProcessMemory  = k32.ReadProcessMemory
+ReadProcessMemory.argtypes = [wt.HANDLE, wt.LPCVOID, wt.LPVOID, ctypes.c_size_t,
+                              ctypes.POINTER(ctypes.c_size_t)]
+ReadProcessMemory.restype = wt.BOOL
+VirtualProtectEx   = k32.VirtualProtectEx
+VirtualProtectEx.argtypes = [wt.HANDLE, wt.LPVOID, ctypes.c_size_t, wt.DWORD,
+                             ctypes.POINTER(wt.DWORD)]
+VirtualProtectEx.restype = wt.BOOL
+
+
+def read_bytes(h, addr, n):
+    buf = (ctypes.c_ubyte * n)()
+    sz = ctypes.c_size_t(0)
+    if not ReadProcessMemory(h, addr, buf, n, ctypes.byref(sz)):
+        raise OSError(f"read 0x{addr:08x} err={ctypes.get_last_error()}")
+    return bytes(buf[:sz.value])
+
+
+def write_bytes(h, addr, data):
+    old_prot = wt.DWORD(0)
+    if not VirtualProtectEx(h, addr, len(data), PAGE_EXECUTE_READWRITE, ctypes.byref(old_prot)):
+        raise OSError(f"VirtualProtectEx 0x{addr:08x} err={ctypes.get_last_error()}")
+    sz = ctypes.c_size_t(0)
+    ok = WriteProcessMemory(h, addr, data, len(data), ctypes.byref(sz))
+    err = ctypes.get_last_error() if not ok else 0
+    restored = wt.DWORD(0)
+    VirtualProtectEx(h, addr, len(data), old_prot.value, ctypes.byref(restored))
+    if not ok:
+        raise OSError(f"write 0x{addr:08x} err={err}")
+
+
+def apply_or_revert(h, site_va, orig, patched, label, revert):
+    cur = read_bytes(h, site_va, 6)
+    print(f"  {label} @ 0x{site_va:08x}: current {cur.hex()}")
+    if revert:
+        if cur == orig:
+            print(f"    already original")
+            return
+        if cur != patched:
+            print(f"    UNEXPECTED — neither orig nor patched. refusing.")
+            sys.exit(3)
+        write_bytes(h, site_va, orig)
+        after = read_bytes(h, site_va, 6)
+        print(f"    reverted; bytes now: {after.hex()}")
+        return
+
+    if cur == patched:
+        print(f"    already patched")
+        return
+    if cur != orig:
+        print(f"    UNEXPECTED — bytes don't match expected original. refusing.")
+        sys.exit(4)
+    write_bytes(h, site_va, patched)
+    after = read_bytes(h, site_va, 6)
+    print(f"    patched; bytes now: {after.hex()}")
+    if after != patched:
+        print(f"    MISMATCH — write didn't take")
+        sys.exit(5)
+
+
+def main():
+    ap = argparse.ArgumentParser()
+    ap.add_argument("pid", type=int)
+    ap.add_argument("--revert", action="store_true",
+                    help="restore original instructions at both sites")
+    args = ap.parse_args()
+
+    h = OpenProcess(
+        PROCESS_VM_READ | PROCESS_VM_WRITE | PROCESS_VM_OPERATION | PROCESS_QUERY_INFORMATION,
+        False, args.pid,
+    )
+    if not h:
+        print(f"OpenProcess({args.pid}) err={ctypes.get_last_error()}")
+        sys.exit(2)
+
+    print(f"PID {args.pid}")
+    apply_or_revert(h, SITE_VIS_VA, SITE_VIS_ORIG, SITE_VIS_NOP,
+                    "visibility guard (jz)", args.revert)
+    apply_or_revert(h, SITE_AF_VA, SITE_AF_ORIG, SITE_AF_NOP,
+                    "auto-fit guard (jne) ", args.revert)
+    print("  OK")
+    CloseHandle(h)
+
+
+if __name__ == "__main__":
+    main()