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authorKevin Wolf <kwolf@redhat.com>2020-02-24 15:30:06 +0100
committerKevin Wolf <kwolf@redhat.com>2020-03-06 17:21:28 +0100
commit8e9119a807df510f0d2ce4cdda3078166d6e99a7 (patch)
tree95d403e3ab3b873d8a87cec6fd4530dbc2fdffb3 /monitor
parentf27a9bb3e9c3bd822243f6fc1d921f1334e37acf (diff)
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hmp: Fail gracefully if chardev is already in use
Trying to attach a HMP monitor to a chardev that is already in use results in a crash because monitor_init_hmp() passes &error_abort to qemu_chr_fe_init(): $ ./x86_64-softmmu/qemu-system-x86_64 --chardev stdio,id=foo --mon foo --mon foo QEMU 4.2.50 monitor - type 'help' for more information (qemu) Unexpected error in qemu_chr_fe_init() at chardev/char-fe.c:220: qemu-system-x86_64: --mon foo: Device 'foo' is in use Abgebrochen (Speicherabzug geschrieben) Fix this by allowing monitor_init_hmp() to return an error and passing any error in qemu_chr_fe_init() to its caller instead of aborting. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Message-Id: <20200224143008.13362-19-kwolf@redhat.com> Acked-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'monitor')
-rw-r--r--monitor/hmp.c8
-rw-r--r--monitor/monitor.c2
2 files changed, 7 insertions, 3 deletions
diff --git a/monitor/hmp.c b/monitor/hmp.c
index 944fa96..d598dd0 100644
--- a/monitor/hmp.c
+++ b/monitor/hmp.c
@@ -1399,12 +1399,16 @@ static void monitor_readline_flush(void *opaque)
monitor_flush(&mon->common);
}
-void monitor_init_hmp(Chardev *chr, bool use_readline)
+void monitor_init_hmp(Chardev *chr, bool use_readline, Error **errp)
{
MonitorHMP *mon = g_new0(MonitorHMP, 1);
+ if (!qemu_chr_fe_init(&mon->common.chr, chr, errp)) {
+ g_free(mon);
+ return;
+ }
+
monitor_data_init(&mon->common, false, false, false);
- qemu_chr_fe_init(&mon->common.chr, chr, &error_abort);
mon->use_readline = use_readline;
if (mon->use_readline) {
diff --git a/monitor/monitor.c b/monitor/monitor.c
index 00d2876..2282bf6 100644
--- a/monitor/monitor.c
+++ b/monitor/monitor.c
@@ -631,7 +631,7 @@ int monitor_init(MonitorOptions *opts, Error **errp)
warn_report("'pretty' is deprecated for HMP monitors, it has no "
"effect and will be removed in future versions");
}
- monitor_init_hmp(chr, true);
+ monitor_init_hmp(chr, true, &local_err);
break;
default:
g_assert_not_reached();