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[SCTP]: Fix potential null pointer dereference while handling an icmp error 

Signed-off-by: Sridhar Samudrala <sri@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sridhar Samudrala 2005-07-18 13:44:10 -07:00 committed by David S. Miller
parent ee71a29eb5
commit d1ad1ff299
3 changed files with 18 additions and 43 deletions
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7
include/net/sctp/sctp.h
View File

@ -167,15 +167,12 @@ void sctp_unhash_established(struct sctp_association *);
void sctp_hash_endpoint(struct sctp_endpoint *);
void sctp_unhash_endpoint(struct sctp_endpoint *);
struct sock *sctp_err_lookup(int family, struct sk_buff *,
struct sctphdr *, struct sctp_endpoint **,
struct sctp_association **,
struct sctphdr *, struct sctp_association **,
struct sctp_transport **);
void sctp_err_finish(struct sock *, struct sctp_endpoint *,
struct sctp_association *);
void sctp_err_finish(struct sock *, struct sctp_association *);
void sctp_icmp_frag_needed(struct sock *, struct sctp_association *,
struct sctp_transport *t, __u32 pmtu);
void sctp_icmp_proto_unreachable(struct sock *sk,
struct sctp_endpoint *ep,
struct sctp_association *asoc,
struct sctp_transport *t);

47
net/sctp/input.c
View File

@ -351,7 +351,6 @@ void sctp_icmp_frag_needed(struct sock *sk, struct sctp_association *asoc,
*
*/
void sctp_icmp_proto_unreachable(struct sock *sk,
struct sctp_endpoint *ep,
struct sctp_association *asoc,
struct sctp_transport *t)
{
@ -367,7 +366,6 @@ void sctp_icmp_proto_unreachable(struct sock *sk,
/* Common lookup code for icmp/icmpv6 error handler. */
struct sock *sctp_err_lookup(int family, struct sk_buff *skb,
struct sctphdr *sctphdr,
struct sctp_endpoint **epp,
struct sctp_association **app,
struct sctp_transport **tpp)
{
@ -375,11 +373,10 @@ struct sock *sctp_err_lookup(int family, struct sk_buff *skb,
union sctp_addr daddr;
struct sctp_af *af;
struct sock *sk = NULL;
struct sctp_endpoint *ep = NULL;
struct sctp_association *asoc = NULL;
struct sctp_transport *transport = NULL;
*app = NULL; *epp = NULL; *tpp = NULL;
*app = NULL; *tpp = NULL;
af = sctp_get_af_specific(family);
if (unlikely(!af)) {
@ -394,27 +391,16 @@ struct sock *sctp_err_lookup(int family, struct sk_buff *skb,
* packet.
*/
asoc = __sctp_lookup_association(&saddr, &daddr, &transport);
if (!asoc) {
/* If there is no matching association, see if it matches any
* endpoint. This may happen for an ICMP error generated in
* response to an INIT_ACK.
*/
ep = __sctp_rcv_lookup_endpoint(&daddr);
if (!ep) {
return NULL;
}
if (!asoc)
return NULL;
sk = asoc->base.sk;
if (ntohl(sctphdr->vtag) != asoc->c.peer_vtag) {
ICMP_INC_STATS_BH(ICMP_MIB_INERRORS);
goto out;
}
if (asoc) {
sk = asoc->base.sk;
if (ntohl(sctphdr->vtag) != asoc->c.peer_vtag) {
ICMP_INC_STATS_BH(ICMP_MIB_INERRORS);
goto out;
}
} else
sk = ep->base.sk;
sctp_bh_lock_sock(sk);
/* If too many ICMPs get dropped on busy
@ -423,7 +409,6 @@ struct sock *sctp_err_lookup(int family, struct sk_buff *skb,
if (sock_owned_by_user(sk))
NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS);
*epp = ep;
*app = asoc;
*tpp = transport;
return sk;
@ -432,21 +417,16 @@ out:
sock_put(sk);
if (asoc)
sctp_association_put(asoc);
if (ep)
sctp_endpoint_put(ep);
return NULL;
}
/* Common cleanup code for icmp/icmpv6 error handler. */
void sctp_err_finish(struct sock *sk, struct sctp_endpoint *ep,
struct sctp_association *asoc)
void sctp_err_finish(struct sock *sk, struct sctp_association *asoc)
{
sctp_bh_unlock_sock(sk);
sock_put(sk);
if (asoc)
sctp_association_put(asoc);
if (ep)
sctp_endpoint_put(ep);
}
/*
@ -471,7 +451,6 @@ void sctp_v4_err(struct sk_buff *skb, __u32 info)
int type = skb->h.icmph->type;
int code = skb->h.icmph->code;
struct sock *sk;
struct sctp_endpoint *ep;
struct sctp_association *asoc;
struct sctp_transport *transport;
struct inet_sock *inet;
@ -488,7 +467,7 @@ void sctp_v4_err(struct sk_buff *skb, __u32 info)
savesctp = skb->h.raw;
skb->nh.iph = iph;
skb->h.raw = (char *)sh;
sk = sctp_err_lookup(AF_INET, skb, sh, &ep, &asoc, &transport);
sk = sctp_err_lookup(AF_INET, skb, sh, &asoc, &transport);
/* Put back, the original pointers. */
skb->nh.raw = saveip;
skb->h.raw = savesctp;
@ -515,7 +494,7 @@ void sctp_v4_err(struct sk_buff *skb, __u32 info)
}
else {
if (ICMP_PROT_UNREACH == code) {
sctp_icmp_proto_unreachable(sk, ep, asoc,
sctp_icmp_proto_unreachable(sk, asoc,
transport);
goto out_unlock;
}
@ -544,7 +523,7 @@ void sctp_v4_err(struct sk_buff *skb, __u32 info)
}
out_unlock:
sctp_err_finish(sk, ep, asoc);
sctp_err_finish(sk, asoc);
}
/*

7
net/sctp/ipv6.c
View File

@ -91,7 +91,6 @@ SCTP_STATIC void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
struct ipv6hdr *iph = (struct ipv6hdr *)skb->data;
struct sctphdr *sh = (struct sctphdr *)(skb->data + offset);
struct sock *sk;
struct sctp_endpoint *ep;
struct sctp_association *asoc;
struct sctp_transport *transport;
struct ipv6_pinfo *np;
@ -105,7 +104,7 @@ SCTP_STATIC void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
savesctp = skb->h.raw;
skb->nh.ipv6h = iph;
skb->h.raw = (char *)sh;
sk = sctp_err_lookup(AF_INET6, skb, sh, &ep, &asoc, &transport);
sk = sctp_err_lookup(AF_INET6, skb, sh, &asoc, &transport);
/* Put back, the original pointers. */
skb->nh.raw = saveip;
skb->h.raw = savesctp;
@ -124,7 +123,7 @@ SCTP_STATIC void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
goto out_unlock;
case ICMPV6_PARAMPROB:
if (ICMPV6_UNK_NEXTHDR == code) {
sctp_icmp_proto_unreachable(sk, ep, asoc, transport);
sctp_icmp_proto_unreachable(sk, asoc, transport);
goto out_unlock;
}
break;
@ -142,7 +141,7 @@ SCTP_STATIC void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
}
out_unlock:
sctp_err_finish(sk, ep, asoc);
sctp_err_finish(sk, asoc);
out:
if (likely(idev != NULL))
in6_dev_put(idev);