net: sctp: update stream->incnt after successful allocation of stream_in

hulk inclusion
category: bugfix
bugzilla: 188766, https://gitee.com/openeuler/kernel/issues/I72J0M
CVE: NA

----------------------------------------

The stream->incnt is used to record number of stream_in.
sctp_stream_alloc_in() allocate array of incnt size for sctp_stream_in.
If array is allocated successfully in sctp_stream_init(), stream->incnt
should be updated with variable incnt.

Fixes: 703397c7 ("sctp: leave the err path free in sctp_stream_init to sctp_stream_free")
Signed-off-by: NDong Chenchen <dongchenchen2@huawei.com>
Reviewed-by: NLiu Jian <liujian56@huawei.com>
Signed-off-by: NZhang Changzhong <zhangchangzhong@huawei.com>

net/sctp/stream.c

@@ -242,7 +242,11 @@ int sctp_stream_init(struct sctp_stream *stream, __u16 outcnt, __u16 incnt,
 	if (!incnt)
 		return 0;
 
-	return sctp_stream_alloc_in(stream, incnt, gfp);
+	ret = sctp_stream_alloc_in(stream, incnt, gfp);
+	if (!ret)
+		stream->incnt = incnt;
+
+	return ret;
 }
 
 int sctp_stream_init_ext(struct sctp_stream *stream, __u16 sid)