[PATCH 4.20 304/352] sctp: check and update stream->out_curr when allocating stream_out

[Greg Kroah-Hartman]

4.20-stable review patch.  If anyone has any objections, please let me know.

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

From: Xin Long <lucien.xin@xxxxxxxxx>

[ Upstream commit cfe4bd7a257f6d6f81d3458d8c9d9ec4957539e6 ]

Now when using stream reconfig to add out streams, stream->out
will get re-allocated, and all old streams' information will
be copied to the new ones and the old ones will be freed.

So without stream->out_curr updated, next time when trying to
send from stream->out_curr stream, a panic would be caused.

This patch is to check and update stream->out_curr when
allocating stream_out.

v1->v2:
  - define fa_index() to get elem index from stream->out_curr.
v2->v3:
  - repost with no change.

Fixes: 5bbbbe32a431 ("sctp: introduce stream scheduler foundations")
Reported-by: Ying Xu <yinxu@xxxxxxxxxx>
Reported-by: syzbot+e33a3a138267ca119c7d@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Xin Long <lucien.xin@xxxxxxxxx>
Acked-by: Neil Horman <nhorman@xxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 net/sctp/stream.c |   20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

--- a/net/sctp/stream.c
+++ b/net/sctp/stream.c
@@ -84,6 +84,19 @@ static void fa_zero(struct flex_array *f
 	}
 }
 
+static size_t fa_index(struct flex_array *fa, void *elem, size_t count)
+{
+	size_t index = 0;
+
+	while (count--) {
+		if (elem == flex_array_get(fa, index))
+			break;
+		index++;
+	}
+
+	return index;
+}
+
 /* Migrates chunks from stream queues to new stream queues if needed,
  * but not across associations. Also, removes those chunks to streams
  * higher than the new max.
@@ -147,6 +160,13 @@ static int sctp_stream_alloc_out(struct
 
 	if (stream->out) {
 		fa_copy(out, stream->out, 0, min(outcnt, stream->outcnt));
+		if (stream->out_curr) {
+			size_t index = fa_index(stream->out, stream->out_curr,
+						stream->outcnt);
+
+			BUG_ON(index == stream->outcnt);
+			stream->out_curr = flex_array_get(out, index);
+		}
 		fa_free(stream->out);
 	}