* [PATCH 1/3] KVM: do not kfree error pointer
@ 2012-11-02 10:33 Guo Chao
2012-11-02 10:33 ` [PATCH 2/3] KVM: X86: fix return value of kvm_vm_ioctl_set_tss_addr() Guo Chao
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: Guo Chao @ 2012-11-02 10:33 UTC (permalink / raw)
To: avi, mtosatti; +Cc: kvm
We should avoid kfree()ing error pointer in kvm_vcpu_ioctl() and
kvm_arch_vcpu_ioctl().
Signed-off-by: Guo Chao <yan@linux.vnet.ibm.com>
---
arch/x86/kvm/x86.c | 19 ++++++-------------
virt/kvm/kvm_main.c | 2 ++
2 files changed, 8 insertions(+), 13 deletions(-)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 224a7e7..b3151ec 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2687,14 +2687,11 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
break;
}
case KVM_SET_LAPIC: {
- r = -EINVAL;
if (!vcpu->arch.apic)
goto out;
u.lapic = memdup_user(argp, sizeof(*u.lapic));
- if (IS_ERR(u.lapic)) {
- r = PTR_ERR(u.lapic);
- goto out;
- }
+ if (IS_ERR(u.lapic))
+ return PTR_ERR(u.lapic);
r = kvm_vcpu_ioctl_set_lapic(vcpu, u.lapic);
if (r)
@@ -2875,10 +2872,8 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
}
case KVM_SET_XSAVE: {
u.xsave = memdup_user(argp, sizeof(*u.xsave));
- if (IS_ERR(u.xsave)) {
- r = PTR_ERR(u.xsave);
- goto out;
- }
+ if (IS_ERR(u.xsave))
+ return PTR_ERR(u.xsave);
r = kvm_vcpu_ioctl_x86_set_xsave(vcpu, u.xsave);
break;
@@ -2900,10 +2895,8 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
}
case KVM_SET_XCRS: {
u.xcrs = memdup_user(argp, sizeof(*u.xcrs));
- if (IS_ERR(u.xcrs)) {
- r = PTR_ERR(u.xcrs);
- goto out;
- }
+ if (IS_ERR(u.xcrs))
+ return PTR_ERR(u.xcrs);
r = kvm_vcpu_ioctl_x86_set_xcrs(vcpu, u.xcrs);
break;
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index be70035..f73efe0 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1954,6 +1954,7 @@ out_free2:
kvm_sregs = memdup_user(argp, sizeof(*kvm_sregs));
if (IS_ERR(kvm_sregs)) {
r = PTR_ERR(kvm_sregs);
+ kvm_sregs = NULL;
goto out;
}
r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
@@ -2054,6 +2055,7 @@ out_free2:
fpu = memdup_user(argp, sizeof(*fpu));
if (IS_ERR(fpu)) {
r = PTR_ERR(fpu);
+ fpu = NULL;
goto out;
}
r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
--
1.7.9.5
^ permalink raw reply related [flat|nested] 4+ messages in thread
* [PATCH 2/3] KVM: X86: fix return value of kvm_vm_ioctl_set_tss_addr()
2012-11-02 10:33 [PATCH 1/3] KVM: do not kfree error pointer Guo Chao
@ 2012-11-02 10:33 ` Guo Chao
2012-11-02 10:33 ` [PATCH 3/3] KVM: remove unnecessary return value check Guo Chao
2012-11-14 0:15 ` [PATCH 1/3] KVM: do not kfree error pointer Marcelo Tosatti
2 siblings, 0 replies; 4+ messages in thread
From: Guo Chao @ 2012-11-02 10:33 UTC (permalink / raw)
To: avi, mtosatti; +Cc: kvm
Return value of this function will be that of ioctl().
#include <stdio.h>
#include <linux/kvm.h>
int main () {
int fd;
fd = open ("/dev/kvm", 0);
fd = ioctl (fd, KVM_CREATE_VM, 0);
ioctl (fd, KVM_SET_TSS_ADDR, 0xfffff000);
perror ("");
return 0;
}
Output is "Operation not permitted". That's not what
we want.
Return -EINVAL in this case.
Signed-off-by: Guo Chao <yan@linux.vnet.ibm.com>
---
arch/x86/kvm/x86.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index b3151ec..d9d5b5d 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2944,7 +2944,7 @@ static int kvm_vm_ioctl_set_tss_addr(struct kvm *kvm, unsigned long addr)
int ret;
if (addr > (unsigned int)(-3 * PAGE_SIZE))
- return -1;
+ return -EINVAL;
ret = kvm_x86_ops->set_tss_addr(kvm, addr);
return ret;
}
--
1.7.9.5
^ permalink raw reply related [flat|nested] 4+ messages in thread
* [PATCH 3/3] KVM: remove unnecessary return value check
2012-11-02 10:33 [PATCH 1/3] KVM: do not kfree error pointer Guo Chao
2012-11-02 10:33 ` [PATCH 2/3] KVM: X86: fix return value of kvm_vm_ioctl_set_tss_addr() Guo Chao
@ 2012-11-02 10:33 ` Guo Chao
2012-11-14 0:15 ` [PATCH 1/3] KVM: do not kfree error pointer Marcelo Tosatti
2 siblings, 0 replies; 4+ messages in thread
From: Guo Chao @ 2012-11-02 10:33 UTC (permalink / raw)
To: avi, mtosatti; +Cc: kvm
No need to check return value before breaking switch.
Signed-off-by: Guo Chao <yan@linux.vnet.ibm.com>
---
arch/x86/kvm/x86.c | 32 --------------------------------
virt/kvm/kvm_main.c | 30 ------------------------------
2 files changed, 62 deletions(-)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index d9d5b5d..2aac611 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2694,9 +2694,6 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
return PTR_ERR(u.lapic);
r = kvm_vcpu_ioctl_set_lapic(vcpu, u.lapic);
- if (r)
- goto out;
- r = 0;
break;
}
case KVM_INTERRUPT: {
@@ -2706,16 +2703,10 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
if (copy_from_user(&irq, argp, sizeof irq))
goto out;
r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
- if (r)
- goto out;
- r = 0;
break;
}
case KVM_NMI: {
r = kvm_vcpu_ioctl_nmi(vcpu);
- if (r)
- goto out;
- r = 0;
break;
}
case KVM_SET_CPUID: {
@@ -2726,8 +2717,6 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
goto out;
r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
- if (r)
- goto out;
break;
}
case KVM_SET_CPUID2: {
@@ -2739,8 +2728,6 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
goto out;
r = kvm_vcpu_ioctl_set_cpuid2(vcpu, &cpuid,
cpuid_arg->entries);
- if (r)
- goto out;
break;
}
case KVM_GET_CPUID2: {
@@ -3205,8 +3192,6 @@ long kvm_arch_vm_ioctl(struct file *filp,
switch (ioctl) {
case KVM_SET_TSS_ADDR:
r = kvm_vm_ioctl_set_tss_addr(kvm, arg);
- if (r < 0)
- goto out;
break;
case KVM_SET_IDENTITY_MAP_ADDR: {
u64 ident_addr;
@@ -3215,14 +3200,10 @@ long kvm_arch_vm_ioctl(struct file *filp,
if (copy_from_user(&ident_addr, argp, sizeof ident_addr))
goto out;
r = kvm_vm_ioctl_set_identity_map_addr(kvm, ident_addr);
- if (r < 0)
- goto out;
break;
}
case KVM_SET_NR_MMU_PAGES:
r = kvm_vm_ioctl_set_nr_mmu_pages(kvm, arg);
- if (r)
- goto out;
break;
case KVM_GET_NR_MMU_PAGES:
r = kvm_vm_ioctl_get_nr_mmu_pages(kvm);
@@ -3313,8 +3294,6 @@ long kvm_arch_vm_ioctl(struct file *filp,
r = 0;
get_irqchip_out:
kfree(chip);
- if (r)
- goto out;
break;
}
case KVM_SET_IRQCHIP: {
@@ -3336,8 +3315,6 @@ long kvm_arch_vm_ioctl(struct file *filp,
r = 0;
set_irqchip_out:
kfree(chip);
- if (r)
- goto out;
break;
}
case KVM_GET_PIT: {
@@ -3364,9 +3341,6 @@ long kvm_arch_vm_ioctl(struct file *filp,
if (!kvm->arch.vpit)
goto out;
r = kvm_vm_ioctl_set_pit(kvm, &u.ps);
- if (r)
- goto out;
- r = 0;
break;
}
case KVM_GET_PIT2: {
@@ -3390,9 +3364,6 @@ long kvm_arch_vm_ioctl(struct file *filp,
if (!kvm->arch.vpit)
goto out;
r = kvm_vm_ioctl_set_pit2(kvm, &u.ps2);
- if (r)
- goto out;
- r = 0;
break;
}
case KVM_REINJECT_CONTROL: {
@@ -3401,9 +3372,6 @@ long kvm_arch_vm_ioctl(struct file *filp,
if (copy_from_user(&control, argp, sizeof(control)))
goto out;
r = kvm_vm_ioctl_reinject(kvm, &control);
- if (r)
- goto out;
- r = 0;
break;
}
case KVM_XEN_HVM_CONFIG: {
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index f73efe0..baeabaa 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1929,10 +1929,6 @@ out_free1:
goto out;
}
r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
- if (r)
- goto out_free2;
- r = 0;
-out_free2:
kfree(kvm_regs);
break;
}
@@ -1958,9 +1954,6 @@ out_free2:
goto out;
}
r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
- if (r)
- goto out;
- r = 0;
break;
}
case KVM_GET_MP_STATE: {
@@ -1982,9 +1975,6 @@ out_free2:
if (copy_from_user(&mp_state, argp, sizeof mp_state))
goto out;
r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
- if (r)
- goto out;
- r = 0;
break;
}
case KVM_TRANSLATE: {
@@ -2009,9 +1999,6 @@ out_free2:
if (copy_from_user(&dbg, argp, sizeof dbg))
goto out;
r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg);
- if (r)
- goto out;
- r = 0;
break;
}
case KVM_SET_SIGNAL_MASK: {
@@ -2059,9 +2046,6 @@ out_free2:
goto out;
}
r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
- if (r)
- goto out;
- r = 0;
break;
}
default:
@@ -2131,8 +2115,6 @@ static long kvm_vm_ioctl(struct file *filp,
switch (ioctl) {
case KVM_CREATE_VCPU:
r = kvm_vm_ioctl_create_vcpu(kvm, arg);
- if (r < 0)
- goto out;
break;
case KVM_SET_USER_MEMORY_REGION: {
struct kvm_userspace_memory_region kvm_userspace_mem;
@@ -2143,8 +2125,6 @@ static long kvm_vm_ioctl(struct file *filp,
goto out;
r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1);
- if (r)
- goto out;
break;
}
case KVM_GET_DIRTY_LOG: {
@@ -2154,8 +2134,6 @@ static long kvm_vm_ioctl(struct file *filp,
if (copy_from_user(&log, argp, sizeof log))
goto out;
r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
- if (r)
- goto out;
break;
}
#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
@@ -2165,9 +2143,6 @@ static long kvm_vm_ioctl(struct file *filp,
if (copy_from_user(&zone, argp, sizeof zone))
goto out;
r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
- if (r)
- goto out;
- r = 0;
break;
}
case KVM_UNREGISTER_COALESCED_MMIO: {
@@ -2176,9 +2151,6 @@ static long kvm_vm_ioctl(struct file *filp,
if (copy_from_user(&zone, argp, sizeof zone))
goto out;
r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
- if (r)
- goto out;
- r = 0;
break;
}
#endif
@@ -2287,8 +2259,6 @@ static long kvm_vm_compat_ioctl(struct file *filp,
log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap);
r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
- if (r)
- goto out;
break;
}
default:
--
1.7.9.5
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH 1/3] KVM: do not kfree error pointer
2012-11-02 10:33 [PATCH 1/3] KVM: do not kfree error pointer Guo Chao
2012-11-02 10:33 ` [PATCH 2/3] KVM: X86: fix return value of kvm_vm_ioctl_set_tss_addr() Guo Chao
2012-11-02 10:33 ` [PATCH 3/3] KVM: remove unnecessary return value check Guo Chao
@ 2012-11-14 0:15 ` Marcelo Tosatti
2 siblings, 0 replies; 4+ messages in thread
From: Marcelo Tosatti @ 2012-11-14 0:15 UTC (permalink / raw)
To: Guo Chao; +Cc: avi, kvm
On Fri, Nov 02, 2012 at 06:33:21PM +0800, Guo Chao wrote:
> We should avoid kfree()ing error pointer in kvm_vcpu_ioctl() and
> kvm_arch_vcpu_ioctl().
>
> Signed-off-by: Guo Chao <yan@linux.vnet.ibm.com>
Applied all, thanks.
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2012-11-14 0:15 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2012-11-02 10:33 [PATCH 1/3] KVM: do not kfree error pointer Guo Chao
2012-11-02 10:33 ` [PATCH 2/3] KVM: X86: fix return value of kvm_vm_ioctl_set_tss_addr() Guo Chao
2012-11-02 10:33 ` [PATCH 3/3] KVM: remove unnecessary return value check Guo Chao
2012-11-14 0:15 ` [PATCH 1/3] KVM: do not kfree error pointer Marcelo Tosatti
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