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| author | Sridhar Samudrala <sri@us.ibm.com> | 2006-05-05 17:04:43 -0700 |
|---|---|---|
| committer | Chris Wright <chrisw@sous-sol.org> | 2006-05-09 12:53:20 -0700 |
| commit | 40885c13b394cd1b74acc196f1d7990a3e0a484d (patch) | |
| tree | 999c085e5d634b5ed5eb526216cf8813c1a23098 | |
| parent | bf7d8bacaaf241a0f0157986fd4e1e6834873d50 (diff) | |
| download | lwn-40885c13b394cd1b74acc196f1d7990a3e0a484d.tar.gz lwn-40885c13b394cd1b74acc196f1d7990a3e0a484d.zip | |
[PATCH] SCTP: Fix panic's when receiving fragmented SCTP control chunks. (CVE-2006-2272)
Use pskb_pull() to handle incoming COOKIE_ECHO and HEARTBEAT chunks that
are received as skb's with fragment list.
Signed-off-by: Sridhar Samudrala <sri@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
| -rw-r--r-- | net/sctp/sm_statefuns.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c index 2b9a832b29a7..db2c0e74afdb 100644 --- a/net/sctp/sm_statefuns.c +++ b/net/sctp/sm_statefuns.c @@ -636,8 +636,9 @@ sctp_disposition_t sctp_sf_do_5_1D_ce(const struct sctp_endpoint *ep, */ chunk->subh.cookie_hdr = (struct sctp_signed_cookie *)chunk->skb->data; - skb_pull(chunk->skb, - ntohs(chunk->chunk_hdr->length) - sizeof(sctp_chunkhdr_t)); + if (!pskb_pull(chunk->skb, ntohs(chunk->chunk_hdr->length) - + sizeof(sctp_chunkhdr_t))) + goto nomem; /* 5.1 D) Upon reception of the COOKIE ECHO chunk, Endpoint * "Z" will reply with a COOKIE ACK chunk after building a TCB @@ -965,7 +966,8 @@ sctp_disposition_t sctp_sf_beat_8_3(const struct sctp_endpoint *ep, */ chunk->subh.hb_hdr = (sctp_heartbeathdr_t *) chunk->skb->data; paylen = ntohs(chunk->chunk_hdr->length) - sizeof(sctp_chunkhdr_t); - skb_pull(chunk->skb, paylen); + if (!pskb_pull(chunk->skb, paylen)) + goto nomem; reply = sctp_make_heartbeat_ack(asoc, chunk, chunk->subh.hb_hdr, paylen); @@ -1860,8 +1862,9 @@ sctp_disposition_t sctp_sf_do_5_2_4_dupcook(const struct sctp_endpoint *ep, * are in good shape. */ chunk->subh.cookie_hdr = (struct sctp_signed_cookie *)chunk->skb->data; - skb_pull(chunk->skb, ntohs(chunk->chunk_hdr->length) - - sizeof(sctp_chunkhdr_t)); + if (!pskb_pull(chunk->skb, ntohs(chunk->chunk_hdr->length) - + sizeof(sctp_chunkhdr_t))) + goto nomem; /* In RFC 2960 5.2.4 3, if both Verification Tags in the State Cookie * of a duplicate COOKIE ECHO match the Verification Tags of the |