[PATCH net] sctp: fix the data size calculation in sctp_data_size

[Xin Long]

sctp data size should be calculated by subtracting data chunk header's
length from chunk_hdr->length, not just data header.

Fixes: 668c9beb9020 ("sctp: implement assign_number for sctp_stream_interleave")
Signed-off-by: Xin Long <lucien....@gmail.com>
---
 include/net/sctp/sm.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/net/sctp/sm.h b/include/net/sctp/sm.h
index 5ef1bad..9e3d327 100644
--- a/include/net/sctp/sm.h
+++ b/include/net/sctp/sm.h
@@ -347,7 +347,7 @@ static inline __u16 sctp_data_size(struct sctp_chunk *chunk)
        __u16 size;
 
        size = ntohs(chunk->chunk_hdr->length);
-       size -= sctp_datahdr_len(&chunk->asoc->stream);
+       size -= sctp_datachk_len(&chunk->asoc->stream);
 
        return size;
 }
-- 
2.1.0