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| author | David Ahern <dsahern@kernel.org> | 2021-12-30 17:36:35 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-12-31 14:31:59 +0000 |
| commit | 8bda81a4d400cf8a72e554012f0d8c45e07a3904 (patch) | |
| tree | 5958ffe90f2b20ab1471b611cea25a896ec98a3e /net/core | |
| parent | 1ff15a710a862db1101b97810af14aedc835a86a (diff) | |
| download | linux-8bda81a4d400cf8a72e554012f0d8c45e07a3904.tar.gz linux-8bda81a4d400cf8a72e554012f0d8c45e07a3904.tar.bz2 linux-8bda81a4d400cf8a72e554012f0d8c45e07a3904.zip | |
lwtunnel: Validate RTA_ENCAP_TYPE attribute length
lwtunnel_valid_encap_type_attr is used to validate encap attributes
within a multipath route. Add length validation checking to the type.
lwtunnel_valid_encap_type_attr is called converting attributes to
fib{6,}_config struct which means it is used before fib_get_nhs,
ip6_route_multipath_add, and ip6_route_multipath_del - other
locations that use rtnh_ok and then nla_get_u16 on RTA_ENCAP_TYPE
attribute.
Fixes: 9ed59592e3e3 ("lwtunnel: fix autoload of lwt modules")
Signed-off-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core')
| -rw-r--r-- | net/core/lwtunnel.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/net/core/lwtunnel.c b/net/core/lwtunnel.c index 2820aca2173a..9ccd64e8a666 100644 --- a/net/core/lwtunnel.c +++ b/net/core/lwtunnel.c @@ -197,6 +197,10 @@ int lwtunnel_valid_encap_type_attr(struct nlattr *attr, int remaining, nla_entype = nla_find(attrs, attrlen, RTA_ENCAP_TYPE); if (nla_entype) { + if (nla_len(nla_entype) < sizeof(u16)) { + NL_SET_ERR_MSG(extack, "Invalid RTA_ENCAP_TYPE"); + return -EINVAL; + } encap_type = nla_get_u16(nla_entype); if (lwtunnel_valid_encap_type(encap_type, |