linux-kernel - [PATCH bpf-next] bpf: NULL pointer check is not needed in BPF_CGROUP_RUN_PROG_INET

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Message-Id: <1519369121-22269-1-git-send-email-laoar.shao@gmail.com>
Date:   Fri, 23 Feb 2018 14:58:41 +0800
From:   Yafang Shao <laoar.shao@...il.com>
To:     dsa@...ulusnetworks.com, ast@...nel.org, daniel@...earbox.net
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Yafang Shao <laoar.shao@...il.com>
Subject: [PATCH bpf-next] 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@...il.com>
---
 include/linux/bpf-cgroup.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/bpf-cgroup.h b/include/linux/bpf-cgroup.h
index a7f16e0..8a45666 100644
--- 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); \
 	}								       \
--
1.8.3.1