netdev - [PATCH net] sctp: partial chunk should be drop without sending abort packet

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Message-Id: <88918657d985bc0e55e64ca232dcd5f2b76b7cb4.1440410910.git.lucien.xin@gmail.com>
Date:	Mon, 24 Aug 2015 18:08:30 +0800
From:	Xin Long <lucien.xin@...il.com>
To:	network dev <netdev@...r.kernel.org>
Cc:	mleitner@...hat.com, davem@...emloft.net
Subject: [PATCH net] sctp: partial chunk should be drop without sending abort packet

as RFC 4960, 6.10 said, *if the receiver detects a partial chunk, it MUST drop
the chunk*, we should not send the abort. but if we put this discard to inside
state machine, it will send abort.

so we just drop the partial chunk there, never let this chunk go into the state
machine.

Signed-off-by: Xin Long <lucien.xin@...il.com>
---
 net/sctp/inqueue.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/net/sctp/inqueue.c b/net/sctp/inqueue.c
index 7e8a16c..a22ca57 100644
--- a/net/sctp/inqueue.c
+++ b/net/sctp/inqueue.c
@@ -183,9 +183,9 @@ struct sctp_chunk *sctp_inq_pop(struct sctp_inq *queue)
 		/* This is not a singleton */
 		chunk->singleton = 0;
 	} else if (chunk->chunk_end > skb_tail_pointer(chunk->skb)) {
-		/* Discard inside state machine. */
-		chunk->pdiscard = 1;
-		chunk->chunk_end = skb_tail_pointer(chunk->skb);
+		sctp_chunk_free(chunk);
+		chunk = queue->in_progress = NULL;
+		return NULL;
 	} else {
 		/* We are at the end of the packet, so mark the chunk
 		 * in case we need to send a SACK.
-- 
2.1.0

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