From: Jo-Philipp Wich <jo@mein.io>
Date: Tue, 11 Feb 2020 07:59:48 +0000 (+0100)
Subject: file: poke ustream after starting deferred program
X-Git-Url: http://git.openwrt.org/?p=project%2Fuhttpd.git;a=commitdiff_plain;h=2ee323c01079248baa9465969df9e25b5fb68cdf

file: poke ustream after starting deferred program

When we're starting a deferred request, the related input ustream might
have gone into read_blocked mode because incoming client request data
exhausted the ustreams internal buffer space. When this happens, edge
triggered uloop read events are "lost" and never re-triggered causing
the script input to never complete.

In order to avoid that deadlock situation, manually poke the input
ustream using ustream_poll() after invoking client_poll_post_data()
which should have drained (some) of the buffered input ustream contents.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>
---

diff --git a/file.c b/file.c
index da680a0..85487f8 100644
--- a/file.c
+++ b/file.c
@@ -753,6 +753,7 @@ static void uh_complete_request(struct client *cl)
 		cl->dispatch.data_blocked = false;
 		uh_invoke_script(cl, dr->d, dr->path ? &dr->pi : NULL);
 		client_poll_post_data(cl);
+		ustream_poll(cl->us);
 	}
 }