[eBPF] Fix memory leak when reading perf buffer lost data

Caused a memory leak problem in the optimization PR(#5669) submitted earlier. When the user-mode program receives data from the perf buffer, the address of the handle is fwd_info instead of tracer. In this case, an error occurs when tracer->lost is read.

agent/src/ebpf/user/profile/perf_profiler.c

@@ -292,16 +292,16 @@ static void set_stack_trace_msg(stack_trace_msg_t * msg,
 	}
 }
 
-static void reader_lost_cb_a(void *t, u64 lost)
+static void reader_lost_cb_a(void *cookie, u64 lost)
 {
-	struct bpf_tracer *tracer = (struct bpf_tracer *)t;
+	struct bpf_tracer *tracer = profiler_tracer;
 	atomic64_add(&tracer->lost, lost);
 	perf_buf_lost_a_count++;
 }
 
-static void reader_lost_cb_b(void *t, u64 lost)
+static void reader_lost_cb_b(void *cookie, u64 lost)
 {
-	struct bpf_tracer *tracer = (struct bpf_tracer *)t;
+	struct bpf_tracer *tracer = profiler_tracer;
 	atomic64_add(&tracer->lost, lost);
 	perf_buf_lost_b_count++;
 }

agent/src/ebpf/user/socket.c

@@ -942,9 +942,10 @@ static void reader_raw_cb(void *cookie, void *raw, int raw_size)
 	atomic64_add(&q->enqueue_nr, nr);
 }
 
-static void reader_lost_cb(void *t, uint64_t lost)
+static void reader_lost_cb(void *cookie, uint64_t lost)
 {
-	struct bpf_tracer *tracer = (struct bpf_tracer *)t;
+	struct reader_forward_info *fwd_info = cookie;
+	struct bpf_tracer *tracer = fwd_info->tracer;
 	atomic64_add(&tracer->lost, lost);
 }
 

agent/src/ebpf/user/tracer.c

@@ -1177,6 +1177,7 @@ static int perf_reader_setup(struct bpf_perf_reader *perf_reader, int thread_nr)
 
 		fwd_info->queue_id = spread_id;
 		fwd_info->cpu_id = i;
+		fwd_info->tracer = perf_reader->tracer;
 
 		ebpf_info("Perf buffer reader cpu(%d) -> queue(%d)\n",
 			  fwd_info->cpu_id, fwd_info->queue_id);

agent/src/ebpf/user/tracer.h

@@ -454,6 +454,7 @@ struct bpf_tracer_param_array {
 struct reader_forward_info {
 	uint64_t queue_id;
 	int cpu_id;
+	struct bpf_tracer *tracer;
 };
 
 extern volatile uint32_t *tracers_lock;