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| author | Eric Sesterhenn / Snakebyte <snakebyte@gmx.de> | 2007-04-09 16:15:05 +0200 |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2007-05-03 10:52:29 +0300 |
| commit | 3964994bb5ba85a3d8b54ae618f7be1cecce916d (patch) | |
| tree | d093a2be86855e37abe7783e257eac4d9eb0ae73 /drivers/kvm/vmx.c | |
| parent | 5008fdf5b6a31240da060c0867d8f16f08ce2384 (diff) | |
| download | lwn-3964994bb5ba85a3d8b54ae618f7be1cecce916d.tar.gz lwn-3964994bb5ba85a3d8b54ae618f7be1cecce916d.zip | |
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 <snakebyte@gmx.de>
Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'drivers/kvm/vmx.c')
| -rw-r--r-- | drivers/kvm/vmx.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c index 61a611691e50..8c0115b54802 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), |