netdev - [PATCH -next v2] btf: fix return value check in btf_vmlinux

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Date:   Fri, 16 Aug 2019 02:40:44 +0000
From:   Wei Yongjun <weiyongjun1@...wei.com>
To:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>
CC:     Wei Yongjun <weiyongjun1@...wei.com>, <netdev@...r.kernel.org>,
        <bpf@...r.kernel.org>, <kernel-janitors@...r.kernel.org>
Subject: [PATCH -next v2] btf: fix return value check in btf_vmlinux_init()

In case of error, the function kobject_create_and_add() returns NULL
pointer not ERR_PTR(). The IS_ERR() test in the return value check
should be replaced with NULL test.

Fixes: 341dfcf8d78e ("btf: expose BTF info through sysfs")
Signed-off-by: Wei Yongjun <weiyongjun1@...wei.com>
Acked-by: Andrii Nakryiko <andriin@...com>
---
 kernel/bpf/sysfs_btf.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/kernel/bpf/sysfs_btf.c b/kernel/bpf/sysfs_btf.c
index 4659349fc795..7ae5dddd1fe6 100644
--- a/kernel/bpf/sysfs_btf.c
+++ b/kernel/bpf/sysfs_btf.c
@@ -30,17 +30,12 @@ static struct kobject *btf_kobj;
 
 static int __init btf_vmlinux_init(void)
 {
-	int err;
-
 	if (!_binary__btf_vmlinux_bin_start)
 		return 0;
 
 	btf_kobj = kobject_create_and_add("btf", kernel_kobj);
-	if (IS_ERR(btf_kobj)) {
-		err = PTR_ERR(btf_kobj);
-		btf_kobj = NULL;
-		return err;
-	}
+	if (!btf_kobj)
+		return -ENOMEM;
 
 	bin_attr_btf_vmlinux.size = _binary__btf_vmlinux_bin_end -
 				    _binary__btf_vmlinux_bin_start;