Do not attempt syscall on invalid stack_id
@@ -178,6 +178,8 @@ void BPFStackTable::clear_table_non_atomic() {
std::vector<uintptr_t> BPFStackTable::get_stack_addr(int stack_id) {
std::vector<uintptr_t> res;
stacktrace_t stack;
+ if (stack_id < 0)
+ return res;
if (!lookup(&stack_id, &stack))
return res;
for (int i = 0; (i < BPF_MAX_STACK_DEPTH) && (stack.ip[i] != 0); i++)
@@ -189,6 +191,8 @@ std::vector<std::string> BPFStackTable::get_stack_symbol(int stack_id,
int pid) {
auto addresses = get_stack_addr(stack_id);
std::vector<std::string> res;
+ if (addresses.empty())
+ return res;
res.reserve(addresses.size());
if (pid < 0)
