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-rw-r--r--net/bridge/br_sysfs_if.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/net/bridge/br_sysfs_if.c b/net/bridge/br_sysfs_if.c
index 0254c35..126a8ea 100644
--- a/net/bridge/br_sysfs_if.c
+++ b/net/bridge/br_sysfs_if.c
@@ -255,6 +255,9 @@ static ssize_t brport_show(struct kobject *kobj,
struct brport_attribute *brport_attr = to_brport_attr(attr);
struct net_bridge_port *p = to_brport(kobj);
+ if (!brport_attr->show)
+ return -EINVAL;
+
return brport_attr->show(p, buf);
}
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