From 3964994bb5ba85a3d8b54ae618f7be1cecce916d Mon Sep 17 00:00:00 2001 From: Eric Sesterhenn / Snakebyte Date: Mon, 9 Apr 2007 16:15:05 +0200 Subject: [PATCH] KVM: Fix overflow bug in overflow detection code The expression sp - 6 < sp where sp is a u16 is undefined in C since 'sp - 6' is promoted to int, and signed overflow is undefined in C. gcc 4.2 actually warns about it. Replace with a simpler test. Signed-off-by: Eric Sesterhenn Signed-off-by: Avi Kivity --- drivers/kvm/vmx.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c index 61a611691e..8c0115b548 100644 --- a/drivers/kvm/vmx.c +++ b/drivers/kvm/vmx.c @@ -1182,7 +1182,7 @@ static void inject_rmode_irq(struct kvm_vcpu *vcpu, int irq) u16 sp = vmcs_readl(GUEST_RSP); u32 ss_limit = vmcs_read32(GUEST_SS_LIMIT); - if (sp > ss_limit || sp - 6 > sp) { + if (sp > ss_limit || sp < 6 ) { vcpu_printf(vcpu, "%s: #SS, rsp 0x%lx ss 0x%lx limit 0x%x\n", __FUNCTION__, vmcs_readl(GUEST_RSP), -- 2.39.5