On Sun, Nov 17, 2024 at 11:18:38AM +0800, guanjing wrote:

sizeof when applied to a pointer typed expression gives the size of the pointer.

tools/testing/selftests/bpf/progs/test_tunnel_kern.c:678:41-47: ERROR: application of sizeof to pointer

The proper fix in this particular case is to code sizeof(*gopt) instead of sizeof(gopt).

This issue was detected with the help of Coccinelle.

Fixes: 5ddafcc377f9 ("selftests/bpf: Fix a few tests for GCC related warnings.") Signed-off-by: guanjing guanjing@cmss.chinamobile.com

---

tools/testing/selftests/bpf/progs/test_tunnel_kern.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/bpf/progs/test_tunnel_kern.c b/tools/testing/selftests/bpf/progs/test_tunnel_kern.c index 32127f1cd687..3a437cdc5c15 100644 --- a/tools/testing/selftests/bpf/progs/test_tunnel_kern.c +++ b/tools/testing/selftests/bpf/progs/test_tunnel_kern.c @@ -675,7 +675,7 @@ int ip6geneve_set_tunnel(struct __sk_buff *skb) gopt->length = 2; /* 4-byte multiple */ *(int *) &gopt->opt_data = bpf_htonl(0xfeedbeef);

• ret = bpf_skb_set_tunnel_opt(skb, gopt, sizeof(gopt));

• ret = bpf_skb_set_tunnel_opt(skb, gopt, sizeof(*gopt));

Good catch!

I think sizeof(local_gopt) is better, to align with geneve_set_tunnel(), what do you think?

Thanks.