From ee9f37f3e5377dfd91045afd2b6ec8e9c75cb191 Mon Sep 17 00:00:00 2001 From: Liang Yan Date: Fri, 7 Feb 2020 14:04:21 +0000 Subject: [PATCH] target/arm/monitor: query-cpu-model-expansion crashed qemu when using machine type none Commit e19afd566781 mentioned that target-arm only supports queryable cpu models 'max', 'host', and the current type when KVM is in use. The logic works well until using machine type none. For machine type none, cpu_type will be null if cpu option is not set by command line, strlen(cpu_type) will terminate process. So We add a check above it. This won't affect i386 and s390x since they do not use current_cpu. Signed-off-by: Liang Yan Message-id: 20200203134251.12986-1-lyan@suse.com Reviewed-by: Andrew Jones Tested-by: Andrew Jones Signed-off-by: Peter Maydell (cherry picked from commit 0999a4ba8718aa96105b978d3567fc7e90244c7e) Signed-off-by: Michael Roth --- target/arm/monitor.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) diff --git a/target/arm/monitor.c b/target/arm/monitor.c index fa054f8a369..782085ca212 100644 --- a/target/arm/monitor.c +++ b/target/arm/monitor.c @@ -136,17 +136,20 @@ CpuModelExpansionInfo *qmp_query_cpu_model_expansion(CpuModelExpansionType type, } if (kvm_enabled()) { - const char *cpu_type = current_machine->cpu_type; - int len = strlen(cpu_type) - strlen(ARM_CPU_TYPE_SUFFIX); bool supported = false; if (!strcmp(model->name, "host") || !strcmp(model->name, "max")) { /* These are kvmarm's recommended cpu types */ supported = true; - } else if (strlen(model->name) == len && - !strncmp(model->name, cpu_type, len)) { - /* KVM is enabled and we're using this type, so it works. */ - supported = true; + } else if (current_machine->cpu_type) { + const char *cpu_type = current_machine->cpu_type; + int len = strlen(cpu_type) - strlen(ARM_CPU_TYPE_SUFFIX); + + if (strlen(model->name) == len && + !strncmp(model->name, cpu_type, len)) { + /* KVM is enabled and we're using this type, so it works. */ + supported = true; + } } if (!supported) { error_setg(errp, "We cannot guarantee the CPU type '%s' works " -- 2.39.5