Gabor Gombas wrote:
> On Fri, Jan 08, 2010 at 07:28:57AM +0800, Zhang, Xiantao wrote:
>
>> For the check "(p && p->exit_reason == EXIT_REASON_PAL_CALL", if p
>> is NULL, the reference about "p->exit_reason ==
>> EXIT_REASON_PAL_CALL" won't be checked any more, so no issue here.
>
>>> diff --git a/arch/ia64/kvm/kvm_fw.c b/arch/ia64/kvm/kvm_fw.c
>>> index e4b8231..d28494f 100644
>>> --- a/arch/ia64/kvm/kvm_fw.c
>>> +++ b/arch/ia64/kvm/kvm_fw.c
>>> @@ -75,9 +75,11 @@ static void set_pal_result(struct kvm_vcpu
>>> *vcpu, struct exit_ctl_data *p;
>>>
>>> p = kvm_get_exit_data(vcpu);
>>> - if (p && p->exit_reason == EXIT_REASON_PAL_CALL) { + if (!p)
>>> + return;
>>> + if (p->exit_reason == EXIT_REASON_PAL_CALL) {
>>> p->u.pal_data.ret = result;
>>> - return ;
>>> + return;
>>> }
>>> INIT_PAL_STATUS_UNIMPLEMENTED(p->u.pal_data.ret);
>
> IMHO it's not the test but the INIT_PAL_STATUS_UNIMPLEMENTED() that
> does the unwanted dereferencing, and that's fixed by the patch.
Make sense.
Xiantao
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