diff options
| author | David Ahern <dsahern@kernel.org> | 2021-12-31 03:36:35 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-01-11 17:35:14 +0300 |
| commit | 41844e68eb92afb935bd0e3366edc6df83b07f26 (patch) | |
| tree | 2cf7f736b7cb011f0d00658666fa77d766f63fa2 | |
| parent | ca0097c543fc65c29c55f1a98b40e9785079737b (diff) | |
| download | linux-41844e68eb92afb935bd0e3366edc6df83b07f26.tar.xz | |
lwtunnel: Validate RTA_ENCAP_TYPE attribute length
commit 8bda81a4d400cf8a72e554012f0d8c45e07a3904 upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | net/core/lwtunnel.c | 4 | ||||
| -rw-r--r-- | net/ipv4/fib_semantics.c | 3 | ||||
| -rw-r--r-- | net/ipv6/route.c | 4 |
3 files changed, 11 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, diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c index 36bc429f1635..92c29ab3d042 100644 --- a/net/ipv4/fib_semantics.c +++ b/net/ipv4/fib_semantics.c @@ -740,6 +740,9 @@ static int fib_get_nhs(struct fib_info *fi, struct rtnexthop *rtnh, } fib_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP); + /* RTA_ENCAP_TYPE length checked in + * lwtunnel_valid_encap_type_attr + */ nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE); if (nla) fib_cfg.fc_encap_type = nla_get_u16(nla); diff --git a/net/ipv6/route.c b/net/ipv6/route.c index 5611592e0e83..d050e0f5baa4 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -5287,6 +5287,10 @@ static int ip6_route_multipath_add(struct fib6_config *cfg, r_cfg.fc_flags |= RTF_GATEWAY; } r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP); + + /* RTA_ENCAP_TYPE length checked in + * lwtunnel_valid_encap_type_attr + */ nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE); if (nla) r_cfg.fc_encap_type = nla_get_u16(nla); |