diff options
| author | Paolo Abeni <pabeni@redhat.com> | 2023-08-29 07:44:56 +0200 |
|---|---|---|
| committer | Paolo Abeni <pabeni@redhat.com> | 2023-08-29 07:44:56 +0200 |
| commit | c873512ef3a39cc1a605b7a5ff2ad0a33d619aa8 (patch) | |
| tree | 8db2b6a6ef0a08f6e9d78dde00bf44bf60d09d54 /net/dccp/ipv6.c | |
| parent | 6c9cfb853063f317b2953c5e852b6bac1eb0cade (diff) | |
| parent | 90ca51e8c654699b672ba61aeaa418dfb3252e5e (diff) | |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
Merge in late fixes to prepare for the 6.6 net-next PR.
No conflicts.
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Diffstat (limited to 'net/dccp/ipv6.c')
| -rw-r--r-- | net/dccp/ipv6.c | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/net/dccp/ipv6.c b/net/dccp/ipv6.c index 686090bc5945..33f6ccf6ba77 100644 --- a/net/dccp/ipv6.c +++ b/net/dccp/ipv6.c @@ -74,7 +74,7 @@ static inline __u64 dccp_v6_init_sequence(struct sk_buff *skb) static int dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, u8 type, u8 code, int offset, __be32 info) { - const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; + const struct ipv6hdr *hdr; const struct dccp_hdr *dh; struct dccp_sock *dp; struct ipv6_pinfo *np; @@ -83,12 +83,17 @@ static int dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, __u64 seq; struct net *net = dev_net(skb->dev); - /* Only need dccph_dport & dccph_sport which are the first - * 4 bytes in dccp header. + /* For the first __dccp_basic_hdr_len() check, we only need dh->dccph_x, + * which is in byte 7 of the dccp header. * Our caller (icmpv6_notify()) already pulled 8 bytes for us. + * + * Later on, we want to access the sequence number fields, which are + * beyond 8 bytes, so we have to pskb_may_pull() ourselves. */ - BUILD_BUG_ON(offsetofend(struct dccp_hdr, dccph_sport) > 8); - BUILD_BUG_ON(offsetofend(struct dccp_hdr, dccph_dport) > 8); + dh = (struct dccp_hdr *)(skb->data + offset); + if (!pskb_may_pull(skb, offset + __dccp_basic_hdr_len(dh))) + return -EINVAL; + hdr = (const struct ipv6hdr *)skb->data; dh = (struct dccp_hdr *)(skb->data + offset); sk = __inet6_lookup_established(net, &dccp_hashinfo, |