Subject: Re: memory leak in sctp_stream_init

From: Marcelo Ricardo Leitner <[email-masked]>
Date: Mon, 16 Dec 2019 21:37:16 -0300

On Mon, Dec 16, 2019 at 11:56:38AM -0300, Marcelo Ricardo Leitner wrote:
...
> Considering that genradix_prealloc() failure is not fatal, seems the
> fix here is to just ignore the failure in sctp_stream_alloc_out() and
> let genradix try again later on.

Better yet, this fixes it here:

---8<---

diff --git a/net/sctp/stream.c b/net/sctp/stream.c
index df60b5ef24cb..e0b01bf912b3 100644
--- a/net/sctp/stream.c
+++ b/net/sctp/stream.c
@@ -84,8 +84,10 @@ static int sctp_stream_alloc_out(struct sctp_stream *stream, __u16 outcnt,
 		return 0;
 
 	ret = genradix_prealloc(&stream->out, outcnt, gfp);
-	if (ret)
+	if (ret) {
+		genradix_free(&stream->out);
 		return ret;
+	}
 
 	stream->outcnt = outcnt;
 	return 0;
@@ -100,8 +102,10 @@ static int sctp_stream_alloc_in(struct sctp_stream *stream, __u16 incnt,
 		return 0;
 
 	ret = genradix_prealloc(&stream->in, incnt, gfp);
-	if (ret)
+	if (ret) {
+		genradix_free(&stream->in);
 		return ret;
+	}
 
 	stream->incnt = incnt;
 	return 0;