From ce1ce3f8b0fed3473c420f65bd3b1850742e6426 Mon Sep 17 00:00:00 2001
From: affansyed <affan.syed.usc@gmail.com>
Date: Fri, 9 Dec 2016 09:04:52 +0500
Subject: [PATCH] fix issue 829

Needed to make array initialized to null before bpf_probe_read as the
verifier was rejecting the original code. will probably need to fix the
tutorial as well
---
 examples/tracing/nodejs_http_server.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/examples/tracing/nodejs_http_server.py b/examples/tracing/nodejs_http_server.py
index 65957f43aba4..1017de563040 100755
--- a/examples/tracing/nodejs_http_server.py
+++ b/examples/tracing/nodejs_http_server.py
@@ -23,7 +23,7 @@
 #include <uapi/linux/ptrace.h>
 int do_trace(struct pt_regs *ctx) {
     uint64_t addr;
-    char path[128];
+    char path[128]={0};
     bpf_usdt_readarg(6, ctx, &addr);
     bpf_probe_read(&path, sizeof(path), (void *)addr);
     bpf_trace_printk("path:%s\\n", path);