| Message ID | 20200407132321.3957-1-ap420073@gmail.com |
|---|---|
| State | New |
| Headers | show |
| Series | [net] hsr: check protocol version in hsr_newlink() | expand |
diff --git a/net/hsr/hsr_netlink.c b/net/hsr/hsr_netlink.c index 5465a395da04..1decb25f6764 100644 --- a/net/hsr/hsr_netlink.c +++ b/net/hsr/hsr_netlink.c @@ -69,10 +69,16 @@ static int hsr_newlink(struct net *src_net, struct net_device *dev, else multicast_spec = nla_get_u8(data[IFLA_HSR_MULTICAST_SPEC]); - if (!data[IFLA_HSR_VERSION]) + if (!data[IFLA_HSR_VERSION]) { hsr_version = 0; - else + } else { hsr_version = nla_get_u8(data[IFLA_HSR_VERSION]); + if (hsr_version > 1) { + NL_SET_ERR_MSG_MOD(extack, + "Only versions 0..1 are supported"); + return -EINVAL; + } + } return hsr_dev_finalize(dev, link, multicast_spec, hsr_version, extack); }
In the current hsr code, only 0 and 1 protocol versions are valid. But current hsr code doesn't check the version, which is received by userspace. Test commands: ip link add dummy0 type dummy ip link add dummy1 type dummy ip link add hsr0 type hsr slave1 dummy0 slave2 dummy1 version 4 In the test commands, version 4 is invalid. So, the command should be failed. After this patch, following error will occur. "Error: hsr: Only versions 0..1 are supported." Fixes: ee1c27977284 ("net/hsr: Added support for HSR v1") Signed-off-by: Taehee Yoo <ap420073@gmail.com> --- net/hsr/hsr_netlink.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-)