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 --- chardev/char.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) (limited to 'chardev') diff --git a/chardev/char.c b/chardev/char.c index 8723756..e775640 100644 --- a/chardev/char.c +++ b/chardev/char.c @@ -737,7 +737,13 @@ Chardev *qemu_chr_new_noreplay(const char *label, const char *filename, if (qemu_opt_get_bool(opts, "mux", 0)) { assert(permit_mux_mon); - monitor_init_hmp(chr, true); + monitor_init_hmp(chr, true, &err); + if (err) { + error_report_err(err); + object_unparent(OBJECT(chr)); + chr = NULL; + goto out; + } } out: -- cgit v1.1