From 8e9119a807df510f0d2ce4cdda3078166d6e99a7 Mon Sep 17 00:00:00 2001 From: Kevin Wolf Date: Mon, 24 Feb 2020 15:30:06 +0100 Subject: 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 Message-Id: <20200224143008.13362-19-kwolf@redhat.com> Acked-by: Stefan Hajnoczi Signed-off-by: Kevin Wolf --- monitor/hmp.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) (limited to 'monitor/hmp.c') diff --git a/monitor/hmp.c b/monitor/hmp.c index 944fa9651e..d598dd02bb 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) { -- cgit 1.4.1