3.16.55-rc1 review patch. If anyone has any objections, please let me know.
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From: Herbert Xu herbert@gondor.apana.org.au
commit bcfd09f7837f5240c30fd2f52ee7293516641faa upstream.
Currently esp will happily create an xfrm state with an unknown encap type for IPv4, without setting the necessary state parameters. This patch fixes it by returning -EINVAL.
There is a similar problem in IPv6 where if the mode is unknown we will skip initialisation while returning zero. However, this is harmless as the mode has already been checked further up the stack. This patch removes this anomaly by aligning the IPv6 behaviour with IPv4 and treating unknown modes (which cannot actually happen) as transport mode.
Fixes: 38320c70d282 ("[IPSEC]: Use crypto_aead and authenc in ESP") Signed-off-by: Herbert Xu herbert@gondor.apana.org.au Signed-off-by: Steffen Klassert steffen.klassert@secunet.com Signed-off-by: Ben Hutchings ben@decadent.org.uk --- net/ipv4/esp4.c | 1 + net/ipv6/esp6.c | 3 +-- 2 files changed, 2 insertions(+), 2 deletions(-)
--- a/net/ipv4/esp4.c +++ b/net/ipv4/esp4.c @@ -657,6 +657,7 @@ static int esp_init_state(struct xfrm_st
switch (encap->encap_type) { default: + err = -EINVAL; goto error; case UDP_ENCAP_ESPINUDP: x->props.header_len += sizeof(struct udphdr); --- a/net/ipv6/esp6.c +++ b/net/ipv6/esp6.c @@ -600,13 +600,12 @@ static int esp6_init_state(struct xfrm_s x->props.header_len += IPV4_BEET_PHMAXLEN + (sizeof(struct ipv6hdr) - sizeof(struct iphdr)); break; + default: case XFRM_MODE_TRANSPORT: break; case XFRM_MODE_TUNNEL: x->props.header_len += sizeof(struct ipv6hdr); break; - default: - goto error; }
align = ALIGN(crypto_aead_blocksize(aead), 4);