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-rw-r--r--net/sctp/sm_statefuns.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
index b6adef8a1e93..e92079d27eae 100644
--- a/net/sctp/sm_statefuns.c
+++ b/net/sctp/sm_statefuns.c
@@ -1055,6 +1055,7 @@ sctp_disposition_t sctp_sf_beat_8_3(struct net *net,
void *arg,
sctp_cmd_seq_t *commands)
{
+ sctp_paramhdr_t *param_hdr;
struct sctp_chunk *chunk = arg;
struct sctp_chunk *reply;
size_t paylen = 0;
@@ -1072,12 +1073,17 @@ sctp_disposition_t sctp_sf_beat_8_3(struct net *net,
* Information field copied from the received HEARTBEAT chunk.
*/
chunk->subh.hb_hdr = (sctp_heartbeathdr_t *) chunk->skb->data;
+ param_hdr = (sctp_paramhdr_t *) chunk->subh.hb_hdr;
paylen = ntohs(chunk->chunk_hdr->length) - sizeof(sctp_chunkhdr_t);
+
+ if (ntohs(param_hdr->length) > paylen)
+ return sctp_sf_violation_paramlen(net, ep, asoc, type, arg,
+ param_hdr, commands);
+
if (!pskb_pull(chunk->skb, paylen))
goto nomem;
- reply = sctp_make_heartbeat_ack(asoc, chunk,
- chunk->subh.hb_hdr, paylen);
+ reply = sctp_make_heartbeat_ack(asoc, chunk, param_hdr, paylen);
if (!reply)
goto nomem;