From 84d811f6af15f9e3ce39f8603e6a2dacf7cdbcba Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Fri, 22 May 2015 15:17:16 +0200
Subject: [PATCH] http2: on_frame_recv: return early on stream 0

Coverity CID 1299426 warned about possible NULL dereference otherwise,
but that would only ever happen if we get invalid HTTP/2 data with
frames for stream 0. Avoid this risk by returning early when stream 0 is
used.
---
 lib/http2.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/http2.c b/lib/http2.c
index 93182429554f0d..a56535471ecddb 100644
--- a/lib/http2.c
+++ b/lib/http2.c
@@ -235,6 +235,9 @@ static int on_frame_recv(nghttp2_session *session, const nghttp2_frame *frame,
     }
     stream = data_s->req.protop;
   }
+  else
+    /* we do nothing on stream zero */
+    return 0;
 
   switch(frame->hd.type) {
   case NGHTTP2_DATA: