41 lines
1.5 KiB
Diff
41 lines
1.5 KiB
Diff
From 447affe29991ee99c6b9732fc5f2c1048a611d3b Mon Sep 17 00:00:00 2001
|
|
From: Riccardo Schirone <sirmy15@gmail.com>
|
|
Date: Fri, 26 Mar 2021 11:50:24 +0100
|
|
Subject: [PATCH] Avoid infinite-loop in avahi-daemon by handling HUP event in
|
|
client_work
|
|
|
|
If a client fills the input buffer, client_work() disables the
|
|
AVAHI_WATCH_IN event, thus preventing the function from executing the
|
|
`read` syscall the next times it is called. However, if the client then
|
|
terminates the connection, the socket file descriptor receives a HUP
|
|
event, which is not handled, thus the kernel keeps marking the HUP event
|
|
as occurring. While iterating over the file descriptors that triggered
|
|
an event, the client file descriptor will keep having the HUP event and
|
|
the client_work() function is always called with AVAHI_WATCH_HUP but
|
|
without nothing being done, thus entering an infinite loop.
|
|
|
|
See https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=984938
|
|
---
|
|
avahi-daemon/simple-protocol.c | 5 +++++
|
|
1 file changed, 5 insertions(+)
|
|
|
|
diff --git a/avahi-daemon/simple-protocol.c b/avahi-daemon/simple-protocol.c
|
|
index 3e0ebb1..6c0274d 100644
|
|
--- a/avahi-daemon/simple-protocol.c
|
|
+++ b/avahi-daemon/simple-protocol.c
|
|
@@ -424,6 +424,11 @@ static void client_work(AvahiWatch *watch, AVAHI_GCC_UNUSED int fd, AvahiWatchEv
|
|
}
|
|
}
|
|
|
|
+ if (events & AVAHI_WATCH_HUP) {
|
|
+ client_free(c);
|
|
+ return;
|
|
+ }
|
|
+
|
|
c->server->poll_api->watch_update(
|
|
watch,
|
|
(c->outbuf_length > 0 ? AVAHI_WATCH_OUT : 0) |
|
|
--
|
|
2.40.0
|
|
|