From a7d1f1b66c05ef4ebb58a34be7caad9af15546a4 Mon Sep 17 00:00:00 2001
From: Tsutomu Fujii <t-fujii@nb.jp.nec.com>
Date: Tue, 17 Jan 2006 11:57:09 -0800
Subject: [PATCH] [SCTP]: Fix sctp_rcv_ootb() to handle the last chunk of a
packet correctly.
Signed-off-by: Tsutomu Fujii <t-fujii@nb.jp.nec.com>
Signed-off-by: Sridhar Samudrala <sri@us.ibm.com>
---
net/sctp/input.c | 13 +++++++++----
net/sctp/sm_statefuns.c | 2 ++
2 files changed, 11 insertions(+), 4 deletions(-)
diff --git a/net/sctp/input.c b/net/sctp/input.c
index 71fd563756414d..cb78b50868eee0 100644
--- a/net/sctp/input.c
+++ b/net/sctp/input.c
@@ -588,10 +588,16 @@ int sctp_rcv_ootb(struct sk_buff *skb)
sctp_errhdr_t *err;
ch = (sctp_chunkhdr_t *) skb->data;
- ch_end = ((__u8 *) ch) + WORD_ROUND(ntohs(ch->length));
/* Scan through all the chunks in the packet. */
- while (ch_end > (__u8 *)ch && ch_end < skb->tail) {
+ do {
+ /* Break out if chunk length is less then minimal. */
+ if (ntohs(ch->length) < sizeof(sctp_chunkhdr_t))
+ break;
+
+ ch_end = ((__u8 *)ch) + WORD_ROUND(ntohs(ch->length));
+ if (ch_end > skb->tail)
+ break;
/* RFC 8.4, 2) If the OOTB packet contains an ABORT chunk, the
* receiver MUST silently discard the OOTB packet and take no
@@ -622,8 +628,7 @@ int sctp_rcv_ootb(struct sk_buff *skb)
}
ch = (sctp_chunkhdr_t *) ch_end;
- ch_end = ((__u8 *) ch) + WORD_ROUND(ntohs(ch->length));
- }
+ } while (ch_end < skb->tail);
return 0;
diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
index 477d7f80dba686..71c9a961c321a1 100644
--- a/net/sctp/sm_statefuns.c
+++ b/net/sctp/sm_statefuns.c
@@ -3090,6 +3090,8 @@ sctp_disposition_t sctp_sf_ootb(const struct sctp_endpoint *ep,
break;
ch_end = ((__u8 *)ch) + WORD_ROUND(ntohs(ch->length));
+ if (ch_end > skb->tail)
+ break;
if (SCTP_CID_SHUTDOWN_ACK == ch->type)
ootb_shut_ack = 1;
--
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