From: Xin Long <lucien.xin@gmail.com>
Date: Sun, 18 Nov 2018 21:59:49 +0800
Subject: sctp: not increase stream's incnt before sending addstrm_in request
Git-commit: e1e46479847e66f78f79d8c24d5169a5954b3fc2
Patch-mainline: v4.20-rc4
References: networking-stable-18_11_21

Different from processing the addstrm_out request, The receiver handles
an addstrm_in request by sending back an addstrm_out request to the
sender who will increase its stream's in and incnt later.

Now stream->incnt has been increased since it sent out the addstrm_in
request in sctp_send_add_streams(), with the wrong stream->incnt will
even cause crash when copying stream info from the old stream's in to
the new one's in sctp_process_strreset_addstrm_out().

This patch is to fix it by simply removing the stream->incnt change
from sctp_send_add_streams().

Fixes: 242bd2d519d7 ("sctp: implement sender-side procedures for Add Incoming/Outgoing Streams Request Parameter")
Reported-by: Jianwen Ji <jiji@redhat.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 net/sctp/stream.c |    1 -
 1 file changed, 1 deletion(-)

--- a/net/sctp/stream.c
+++ b/net/sctp/stream.c
@@ -324,7 +324,6 @@ int sctp_send_add_streams(struct sctp_as
 		goto out;
 	}
 
-	stream->incnt = incnt;
 	stream->outcnt = outcnt;
 
 	asoc->strreset_outstanding = !!out + !!in;