From 0c57893d62596d1d91779452be3b38b4b72ecd04 Mon Sep 17 00:00:00 2001 From: Eric Blake Date: Tue, 23 Oct 2018 22:35:59 +0100 Subject: [PATCH] vl: Avoid crash when -mon is underspecified MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit A quick coredump on an incomplete command line: ./x86_64-softmmu/qemu-system-x86_64 -mon mode=control,pretty=on #0 0x00007ffff723d9e4 in g_str_hash () at /lib64/libglib-2.0.so.0 #1 0x00007ffff723ce38 in g_hash_table_lookup () at /lib64/libglib-2.0.so.0 #2 0x0000555555cc0073 in object_class_property_find (klass=0x5555566a94b0, name=0x0, errp=0x0) at qom/object.c:1135 #3 0x0000555555cc004b in object_class_property_find (klass=0x5555566a9440, name=0x0, errp=0x0) at qom/object.c:1129 #4 0x0000555555cbfe6e in object_property_find (obj=0x5555568348c0, name=0x0, errp=0x0) at qom/object.c:1080 #5 0x0000555555cc183d in object_resolve_path_component (parent=0x5555568348c0, part=0x0) at qom/object.c:1762 #6 0x0000555555d82071 in qemu_chr_find (name=0x0) at chardev/char.c:802 #7 0x00005555559d77cb in mon_init_func (opaque=0x0, opts=0x5555566b65a0, errp=0x0) at vl.c:2291 Fix it to instead fail gracefully. Signed-off-by: Eric Blake Message-Id: <20181023213600.364086-1-eblake@redhat.com> Reviewed-by: Paolo Bonzini Reviewed-by: Philippe Mathieu-Daudé Reviewed-by: Peter Xu Signed-off-by: Markus Armbruster --- vl.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/vl.c b/vl.c index 03ed215d7b..55bab005b6 100644 --- a/vl.c +++ b/vl.c @@ -2323,6 +2323,10 @@ static int mon_init_func(void *opaque, QemuOpts *opts, Error **errp) } chardev = qemu_opt_get(opts, "chardev"); + if (!chardev) { + error_report("chardev is required"); + exit(1); + } chr = qemu_chr_find(chardev); if (chr == NULL) { error_setg(errp, "chardev \"%s\" not found", chardev); -- 2.11.4.GIT