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| author | David Ahern <dsahern@kernel.org> | 2021-12-31 01:36:35 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-12-31 15:31:59 +0100 |
| commit | 8bda81a4d400cf8a72e554012f0d8c45e07a3904 (patch) | |
| tree | 5958ffe90f2b20ab1471b611cea25a896ec98a3e /net | |
| parent | ipv6: Check attribute length for RTA_GATEWAY when deleting multipath route (diff) | |
| download | linux-8bda81a4d400cf8a72e554012f0d8c45e07a3904.tar.xz 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')
| -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 b311c0bc9983..d2ff8a7e1709 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); |