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kvm: Ensure negative return value on kvm_init() error handling path 

We need to ensure ret < 0 when going through the error path, or QEMU may
try to run the half-initialized VM and crash.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Eduardo Habkost 2014-05-30 17:26:22 -03:00 committed by Paolo Bonzini
parent 28fb26f19f
commit 0e1dac6c41
1 changed files with 3 additions and 1 deletions
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4
kvm-all.c
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@ -1374,7 +1374,7 @@ int kvm_init(MachineClass *mc)
ret = kvm_ioctl(s, KVM_GET_API_VERSION, 0); ret = kvm_ioctl(s, KVM_GET_API_VERSION, 0);
if (ret < KVM_API_VERSION) { if (ret < KVM_API_VERSION) {
if (ret > 0) { if (ret >= 0) {
ret = -EINVAL; ret = -EINVAL;
} }
fprintf(stderr, "kvm version too old\n"); fprintf(stderr, "kvm version too old\n");
@ -1425,6 +1425,7 @@ int kvm_init(MachineClass *mc)
if (mc->kvm_type) { if (mc->kvm_type) {
type = mc->kvm_type(kvm_type); type = mc->kvm_type(kvm_type);
} else if (kvm_type) { } else if (kvm_type) {
ret = -EINVAL;
fprintf(stderr, "Invalid argument kvm-type=%s\n", kvm_type); fprintf(stderr, "Invalid argument kvm-type=%s\n", kvm_type);
goto err; goto err;
} }
@ -1525,6 +1526,7 @@ int kvm_init(MachineClass *mc)
return 0; return 0;
err: err:
assert(ret < 0);
if (s->vmfd >= 0) { if (s->vmfd >= 0) {
close(s->vmfd); close(s->vmfd);
} }