From: Taehee Yoo ap420073@gmail.com
[ Upstream commit 4faab8c446def7667adf1f722456c2f4c304069c ]
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 Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/hsr/hsr_netlink.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-)
--- a/net/hsr/hsr_netlink.c +++ b/net/hsr/hsr_netlink.c @@ -61,10 +61,16 @@ static int hsr_newlink(struct net *src_n 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); }