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[Qemu-devel] [PATCH v1 1/3] vnc: don't crash getting server info if lsoc
From: |
Daniel P. Berrange |
Subject: |
[Qemu-devel] [PATCH v1 1/3] vnc: don't crash getting server info if lsock is NULL |
Date: |
Tue, 2 Aug 2016 11:45:24 +0100 |
When VNC is started with '-vnc none' there will be no
listener socket present. When we try to populate the
VncServerInfo we'll crash accessing a NULL 'lsock'
field.
#0 qio_channel_socket_get_local_address (ioc=0x0, address@hidden) at
io/channel-socket.c:33
#1 0x00007f4b9a297d6f in vnc_init_basic_info_from_server_addr
(errp=0x7ffd5b8aa0f0, info=0x7f4b9d425460, ioc=<optimized out>) at ui/vnc.c:146
#2 vnc_server_info_get (vd=0x7f4b9e858000) at ui/vnc.c:223
#3 0x00007f4b9a29d318 in vnc_qmp_event (vs=0x7f4b9ef82000, vs=0x7f4b9ef82000,
event=QAPI_EVENT_VNC_CONNECTED) at ui/vnc.c:279
#4 vnc_connect (address@hidden, address@hidden, address@hidden,
websocket=websocket @entry=false) at ui/vnc.c:2994
#5 0x00007f4b9a29e8c8 in vnc_display_add_client (id=<optimized out>,
csock=<optimized out>, skipauth=<optimized out>) at ui/v nc.c:3825
#6 0x00007f4b9a18d8a1 in qmp_marshal_add_client (args=<optimized out>,
ret=<optimized out>, errp=0x7ffd5b8aa230) at qmp-marsh al.c:123
#7 0x00007f4b9a0b53f5 in handle_qmp_command (parser=<optimized out>,
tokens=<optimized out>) at /usr/src/debug/qemu-2.6.0/mon itor.c:3922
#8 0x00007f4b9a348580 in json_message_process_token (lexer=0x7f4b9c78dfe8,
input=0x7f4b9c7350e0, type=JSON_RCURLY, x=111, y=5 9) at
qobject/json-streamer.c:94
#9 0x00007f4b9a35cfeb in json_lexer_feed_char (address@hidden, ch=125 '}',
address@hidden) at qobj ect/json-lexer.c:310
#10 0x00007f4b9a35d0ae in json_lexer_feed (lexer=0x7f4b9c78dfe8,
buffer=<optimized out>, size=<optimized out>) at qobject/json -lexer.c:360
#11 0x00007f4b9a348679 in json_message_parser_feed (parser=<optimized out>,
buffer=<optimized out>, size=<optimized out>) at q object/json-streamer.c:114
#12 0x00007f4b9a0b3a1b in monitor_qmp_read (opaque=<optimized out>,
buf=<optimized out>, size=<optimized out>) at /usr/src/deb
ug/qemu-2.6.0/monitor.c:3938
#13 0x00007f4b9a186751 in tcp_chr_read (chan=<optimized out>, cond=<optimized
out>, opaque=0x7f4b9c7add40) at qemu-char.c:2895
#14 0x00007f4b92b5c79a in g_main_context_dispatch () from
/lib64/libglib-2.0.so.0
#15 0x00007f4b9a2bb0c0 in glib_pollfds_poll () at main-loop.c:213
#16 os_host_main_loop_wait (timeout=<optimized out>) at main-loop.c:258
#17 main_loop_wait (nonblocking=<optimized out>) at main-loop.c:506
#18 0x00007f4b9a0835cf in main_loop () at vl.c:1934
#19 main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at
vl.c:4667
Do an upfront check for a NULL lsock and report an error to
the caller, which matches behaviour from before
commit 04d2529da27db512dcbd5e99d0e26d333f16efcc
Author: Daniel P. Berrange <address@hidden>
Date: Fri Feb 27 16:20:57 2015 +0000
ui: convert VNC server to use QIOChannelSocket
where getsockname() would be given a FD value -1 and thus report
an error to the caller.
Signed-off-by: Daniel P. Berrange <address@hidden>
---
ui/vnc.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/ui/vnc.c b/ui/vnc.c
index 3ce3a5b..f183d00 100644
--- a/ui/vnc.c
+++ b/ui/vnc.c
@@ -143,6 +143,11 @@ static void
vnc_init_basic_info_from_server_addr(QIOChannelSocket *ioc,
{
SocketAddress *addr = NULL;
+ if (!ioc) {
+ error_setg(errp, "No listener socket available");
+ return;
+ }
+
addr = qio_channel_socket_get_local_address(ioc, errp);
if (!addr) {
return;
--
2.7.4