1 files changed, 5 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/test_pkt_access.c b/tools/testing/selftests/bpf/progs/test_pkt_access.c
index 5cd7c096f62d..bce7173152c6 100644
--- a/tools/testing/selftests/bpf/progs/test_pkt_access.c
+++ b/tools/testing/selftests/bpf/progs/test_pkt_access.c
@@ -13,6 +13,7 @@
 #include <linux/pkt_cls.h>
 #include <bpf/bpf_helpers.h>
 #include <bpf/bpf_endian.h>
+#include "bpf_misc.h"
 
 /* llvm will optimize both subprograms into exactly the same BPF assembly
  *
@@ -51,6 +52,8 @@ int get_skb_len(struct __sk_buff *skb)
 {
 	volatile char buf[MAX_STACK] = {};
 
+	__sink(buf[MAX_STACK - 1]);
+
 	return skb->len;
 }
 
@@ -73,6 +76,8 @@ int get_skb_ifindex(int val, struct __sk_buff *skb, int var)
 {
 	volatile char buf[MAX_STACK] = {};
 
+	__sink(buf[MAX_STACK - 1]);
+
 	return skb->ifindex * val * var;
 }