linux/kernel/bpf/sysfs_btf.c
Wei Yongjun e03250061b 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: 341dfcf8d7 ("btf: expose BTF info through sysfs")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2019-08-15 22:18:17 -07:00

47 lines
1.2 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* Provide kernel BTF information for introspection and use by eBPF tools.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/kobject.h>
#include <linux/init.h>
#include <linux/sysfs.h>
/* See scripts/link-vmlinux.sh, gen_btf() func for details */
extern char __weak _binary__btf_vmlinux_bin_start[];
extern char __weak _binary__btf_vmlinux_bin_end[];
static ssize_t
btf_vmlinux_read(struct file *file, struct kobject *kobj,
struct bin_attribute *bin_attr,
char *buf, loff_t off, size_t len)
{
memcpy(buf, _binary__btf_vmlinux_bin_start + off, len);
return len;
}
static struct bin_attribute bin_attr_btf_vmlinux __ro_after_init = {
.attr = { .name = "vmlinux", .mode = 0444, },
.read = btf_vmlinux_read,
};
static struct kobject *btf_kobj;
static int __init btf_vmlinux_init(void)
{
if (!_binary__btf_vmlinux_bin_start)
return 0;
btf_kobj = kobject_create_and_add("btf", kernel_kobj);
if (!btf_kobj)
return -ENOMEM;
bin_attr_btf_vmlinux.size = _binary__btf_vmlinux_bin_end -
_binary__btf_vmlinux_bin_start;
return sysfs_create_bin_file(btf_kobj, &bin_attr_btf_vmlinux);
}
subsys_initcall(btf_vmlinux_init);