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Subject[PATCH net v2 2/3] net: core: add netdev_class_has_file_ns() helper function
Date
This helper function is to check whether the class file "/sys/class/net/*"
is existing or not.
In the next patch, this helper function will be used.

Reported-by: syzbot+830c6dbfc71edc4f0b8f@syzkaller.appspotmail.com
Fixes: b76cdba9cdb2 ("[PATCH] bonding: add sysfs functionality to bonding (large)")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
---

v1 -> v2:
- use class_has_file_ns(), which is introduced by the first patch.

include/linux/netdevice.h | 2 +-
net/core/net-sysfs.c | 6 ++++++
2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 130a668049ab..a04c487c0975 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -4555,7 +4555,7 @@ int netdev_class_create_file_ns(const struct class_attribute *class_attr,
const void *ns);
void netdev_class_remove_file_ns(const struct class_attribute *class_attr,
const void *ns);
-
+bool netdev_class_has_file_ns(const char *name, const void *ns);
static inline int netdev_class_create_file(const struct class_attribute *class_attr)
{
return netdev_class_create_file_ns(class_attr, NULL);
diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index cf0215734ceb..8a20d658eff0 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -1914,6 +1914,12 @@ void netdev_class_remove_file_ns(const struct class_attribute *class_attr,
}
EXPORT_SYMBOL(netdev_class_remove_file_ns);

+bool netdev_class_has_file_ns(const char *name, const void *ns)
+{
+ return class_has_file_ns(&net_class, name, ns);
+}
+EXPORT_SYMBOL(netdev_class_has_file_ns);
+
int __init netdev_kobject_init(void)
{
kobj_ns_type_register(&net_ns_type_operations);
--
2.17.1
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