Do not return error without an exception set

Author: pablogsal

Modules/_remote_debugging_module.c

@@ -1568,15 +1568,29 @@ cache_tlbc_array(RemoteUnwinderObject *unwinder, uintptr_t code_addr, uintptr_t
     TLBCCacheEntry *entry = NULL;
 
     // Read the TLBC array pointer
-    if (read_ptr(unwinder, tlbc_array_addr, &tlbc_array_ptr) != 0 || tlbc_array_ptr == 0) {
+    if (read_ptr(unwinder, tlbc_array_addr, &tlbc_array_ptr) != 0) {
+        PyErr_SetString(PyExc_RuntimeError, "Failed to read TLBC array pointer");
         set_exception_cause(unwinder, PyExc_RuntimeError, "Failed to read TLBC array pointer");
+        return 0; // Read error
+    }
+
+    // Validate TLBC array pointer
+    if (tlbc_array_ptr == 0) {
+        PyErr_SetString(PyExc_RuntimeError, "TLBC array pointer is NULL");
         return 0; // No TLBC array
     }
 
     // Read the TLBC array size
     Py_ssize_t tlbc_size;
-    if (_Py_RemoteDebug_PagedReadRemoteMemory(&unwinder->handle, tlbc_array_ptr, sizeof(tlbc_size), &tlbc_size) != 0 || tlbc_size <= 0) {
+    if (_Py_RemoteDebug_PagedReadRemoteMemory(&unwinder->handle, tlbc_array_ptr, sizeof(tlbc_size), &tlbc_size) != 0) {
+        PyErr_SetString(PyExc_RuntimeError, "Failed to read TLBC array size");
         set_exception_cause(unwinder, PyExc_RuntimeError, "Failed to read TLBC array size");
+        return 0; // Read error
+    }
+
+    // Validate TLBC array size
+    if (tlbc_size <= 0) {
+        PyErr_SetString(PyExc_RuntimeError, "Invalid TLBC array size");
         return 0; // Invalid size
     }