bpf: NULL pointer check is not needed in BPF_CGROUP_RUN_PROG_INET_SOCK

sk is already allocated in inet_create/inet6_create, hence when
BPF_CGROUP_RUN_PROG_INET_SOCK is executed sk will never be NULL.

The logic is as bellow,
	sk = sk_alloc();
	if (!sk)
		goto out;
	BPF_CGROUP_RUN_PROG_INET_SOCK(sk);

Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

diff --git a/include/linux/bpf-cgroup.h b/include/linux/bpf-cgroup.h
index a7f16e0f8d68b94bc5743a75c41b538794725724..8a4566691c8f7009bc02d31c039c123b4b2fcac3 100644 (file)
--- a/include/linux/bpf-cgroup.h
+++ b/include/linux/bpf-cgroup.h
@@ -96,7 +96,7 @@ int __cgroup_bpf_check_dev_permission(short dev_type, u32 major, u32 minor,
 #define BPF_CGROUP_RUN_PROG_INET_SOCK(sk)                                     \
 ({                                                                            \
        int __ret = 0;                                                         \
-       if (cgroup_bpf_enabled && sk) {                                        \
+       if (cgroup_bpf_enabled) {                                              \
                __ret = __cgroup_bpf_run_filter_sk(sk,                         \
                                                 BPF_CGROUP_INET_SOCK_CREATE); \
        }                                                                      \