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authorXin Long <lucien.xin@gmail.com>2018-02-12 17:15:40 +0800
committerDavid S. Miller <davem@davemloft.net>2018-02-12 11:17:28 -0500
commit1b12580af1d0677c3c3a19e35bfe5d59b03f737f (patch)
treeac6ce08d61e478296fa4130e1350d40f2365f702 /net/bridge/br_sysfs_if.c
parent7ac8ff95f48cbfa609a060fd6a1e361dd62feeb3 (diff)
downloadlinux-1b12580af1d0677c3c3a19e35bfe5d59b03f737f.tar.bz2
bridge: check brport attr show in brport_show
Now br_sysfs_if file flush doesn't have attr show. To read it will cause kernel panic after users chmod u+r this file. Xiong found this issue when running the commands: ip link add br0 type bridge ip link add type veth ip link set veth0 master br0 chmod u+r /sys/devices/virtual/net/veth0/brport/flush timeout 3 cat /sys/devices/virtual/net/veth0/brport/flush kernel crashed with NULL a pointer dereference call trace. This patch is to fix it by return -EINVAL when brport_attr->show is null, just the same as the check for brport_attr->store in brport_store(). Fixes: 9cf637473c85 ("bridge: add sysfs hook to flush forwarding table") Reported-by: Xiong Zhou <xzhou@redhat.com> Signed-off-by: Xin Long <lucien.xin@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/bridge/br_sysfs_if.c')
-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 0254c35b2bf0..126a8ea73c96 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);
}