* [PATCH] MIPS: KVM: Return directly after a failed copy_from_user() in kvm_arch_vcpu_ioctl()
@ 2017-01-18 19:52 SF Markus Elfring
2017-01-19 9:50 ` Paolo Bonzini
2017-01-19 11:13 ` [PATCH] " kbuild test robot
0 siblings, 2 replies; 6+ messages in thread
From: SF Markus Elfring @ 2017-01-18 19:52 UTC (permalink / raw)
To: kvm, linux-mips, James Hogan, Paolo Bonzini,
Radim Krčmář,
Ralf Bächle
Cc: LKML, kernel-janitors
From: Markus Elfring <elfring@users.sourceforge.net>
Date: Wed, 18 Jan 2017 20:43:41 +0100
Return directly after a call of the function "copy_from_user" failed
in a case block.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
---
arch/mips/kvm/mips.c | 7 ++-----
1 file changed, 2 insertions(+), 5 deletions(-)
diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index 06a60b19acfb..1dad78f74e8c 100644
--- a/arch/mips/kvm/mips.c
+++ b/arch/mips/kvm/mips.c
@@ -1152,10 +1152,8 @@ long kvm_arch_vcpu_ioctl(struct file *filp, unsigned int ioctl,
{
struct kvm_mips_interrupt irq;
- r = -EFAULT;
if (copy_from_user(&irq, argp, sizeof(irq)))
- goto out;
-
+ return -EFAULT;
kvm_debug("[%d] %s: irq: %d\n", vcpu->vcpu_id, __func__,
irq.irq);
@@ -1165,9 +1163,8 @@ long kvm_arch_vcpu_ioctl(struct file *filp, unsigned int ioctl,
case KVM_ENABLE_CAP: {
struct kvm_enable_cap cap;
- r = -EFAULT;
if (copy_from_user(&cap, argp, sizeof(cap)))
- goto out;
+ return -EFAULT;
r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
break;
}
--
2.11.0
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH] MIPS: KVM: Return directly after a failed copy_from_user() in kvm_arch_vcpu_ioctl()
2017-01-18 19:52 [PATCH] MIPS: KVM: Return directly after a failed copy_from_user() in kvm_arch_vcpu_ioctl() SF Markus Elfring
@ 2017-01-19 9:50 ` Paolo Bonzini
2017-01-19 10:20 ` [PATCH v2] " SF Markus Elfring
2017-01-19 11:13 ` [PATCH] " kbuild test robot
1 sibling, 1 reply; 6+ messages in thread
From: Paolo Bonzini @ 2017-01-19 9:50 UTC (permalink / raw)
To: SF Markus Elfring, kvm, linux-mips, James Hogan,
Radim Krčmář,
Ralf Bächle
Cc: LKML, kernel-janitors
On 18/01/2017 20:52, SF Markus Elfring wrote:
> From: Markus Elfring <elfring@users.sourceforge.net>
> Date: Wed, 18 Jan 2017 20:43:41 +0100
>
> Return directly after a call of the function "copy_from_user" failed
> in a case block.
>
> Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
The "out" label is now unused, so you should remove it.
Paolo
> ---
> arch/mips/kvm/mips.c | 7 ++-----
> 1 file changed, 2 insertions(+), 5 deletions(-)
>
> diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
> index 06a60b19acfb..1dad78f74e8c 100644
> --- a/arch/mips/kvm/mips.c
> +++ b/arch/mips/kvm/mips.c
> @@ -1152,10 +1152,8 @@ long kvm_arch_vcpu_ioctl(struct file *filp, unsigned int ioctl,
> {
> struct kvm_mips_interrupt irq;
>
> - r = -EFAULT;
> if (copy_from_user(&irq, argp, sizeof(irq)))
> - goto out;
> -
> + return -EFAULT;
> kvm_debug("[%d] %s: irq: %d\n", vcpu->vcpu_id, __func__,
> irq.irq);
>
> @@ -1165,9 +1163,8 @@ long kvm_arch_vcpu_ioctl(struct file *filp, unsigned int ioctl,
> case KVM_ENABLE_CAP: {
> struct kvm_enable_cap cap;
>
> - r = -EFAULT;
> if (copy_from_user(&cap, argp, sizeof(cap)))
> - goto out;
> + return -EFAULT;
> r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
> break;
> }
>
^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH v2] MIPS: KVM: Return directly after a failed copy_from_user() in kvm_arch_vcpu_ioctl()
2017-01-19 9:50 ` Paolo Bonzini
@ 2017-01-19 10:20 ` SF Markus Elfring
2017-01-19 10:27 ` Paolo Bonzini
0 siblings, 1 reply; 6+ messages in thread
From: SF Markus Elfring @ 2017-01-19 10:20 UTC (permalink / raw)
To: kvm, linux-mips, James Hogan, Paolo Bonzini,
Radim Krčmář,
Ralf Bächle
Cc: LKML, kernel-janitors
From: Markus Elfring <elfring@users.sourceforge.net>
Date: Thu, 19 Jan 2017 11:10:26 +0100
* Return directly after a call of the function "copy_from_user" failed
in a case block.
* Delete the jump label "out" which became unnecessary with
this refactoring.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
---
V2:
A label was also removed at the end.
arch/mips/kvm/mips.c | 9 ++-------
1 file changed, 2 insertions(+), 7 deletions(-)
diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index 06a60b19acfb..3534a0b9efed 100644
--- a/arch/mips/kvm/mips.c
+++ b/arch/mips/kvm/mips.c
@@ -1152,10 +1152,8 @@ long kvm_arch_vcpu_ioctl(struct file *filp, unsigned int ioctl,
{
struct kvm_mips_interrupt irq;
- r = -EFAULT;
if (copy_from_user(&irq, argp, sizeof(irq)))
- goto out;
-
+ return -EFAULT;
kvm_debug("[%d] %s: irq: %d\n", vcpu->vcpu_id, __func__,
irq.irq);
@@ -1165,17 +1163,14 @@ long kvm_arch_vcpu_ioctl(struct file *filp, unsigned int ioctl,
case KVM_ENABLE_CAP: {
struct kvm_enable_cap cap;
- r = -EFAULT;
if (copy_from_user(&cap, argp, sizeof(cap)))
- goto out;
+ return -EFAULT;
r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
break;
}
default:
r = -ENOIOCTLCMD;
}
-
-out:
return r;
}
--
2.11.0
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH v2] MIPS: KVM: Return directly after a failed copy_from_user() in kvm_arch_vcpu_ioctl()
2017-01-19 10:20 ` [PATCH v2] " SF Markus Elfring
@ 2017-01-19 10:27 ` Paolo Bonzini
2017-01-19 12:08 ` James Hogan
0 siblings, 1 reply; 6+ messages in thread
From: Paolo Bonzini @ 2017-01-19 10:27 UTC (permalink / raw)
To: SF Markus Elfring, kvm, linux-mips, James Hogan,
Radim Krčmář,
Ralf Bächle
Cc: LKML, kernel-janitors
On 19/01/2017 11:20, SF Markus Elfring wrote:
> From: Markus Elfring <elfring@users.sourceforge.net>
> Date: Thu, 19 Jan 2017 11:10:26 +0100
>
> * Return directly after a call of the function "copy_from_user" failed
> in a case block.
>
> * Delete the jump label "out" which became unnecessary with
> this refactoring.
>
> Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
> ---
>
> V2:
> A label was also removed at the end.
>
> arch/mips/kvm/mips.c | 9 ++-------
> 1 file changed, 2 insertions(+), 7 deletions(-)
>
> diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
> index 06a60b19acfb..3534a0b9efed 100644
> --- a/arch/mips/kvm/mips.c
> +++ b/arch/mips/kvm/mips.c
> @@ -1152,10 +1152,8 @@ long kvm_arch_vcpu_ioctl(struct file *filp, unsigned int ioctl,
> {
> struct kvm_mips_interrupt irq;
>
> - r = -EFAULT;
> if (copy_from_user(&irq, argp, sizeof(irq)))
> - goto out;
> -
> + return -EFAULT;
> kvm_debug("[%d] %s: irq: %d\n", vcpu->vcpu_id, __func__,
> irq.irq);
>
> @@ -1165,17 +1163,14 @@ long kvm_arch_vcpu_ioctl(struct file *filp, unsigned int ioctl,
> case KVM_ENABLE_CAP: {
> struct kvm_enable_cap cap;
>
> - r = -EFAULT;
> if (copy_from_user(&cap, argp, sizeof(cap)))
> - goto out;
> + return -EFAULT;
> r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
> break;
> }
> default:
> r = -ENOIOCTLCMD;
> }
> -
> -out:
> return r;
> }
>
>
Removing the label makes the patch worthwhile.
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] MIPS: KVM: Return directly after a failed copy_from_user() in kvm_arch_vcpu_ioctl()
2017-01-18 19:52 [PATCH] MIPS: KVM: Return directly after a failed copy_from_user() in kvm_arch_vcpu_ioctl() SF Markus Elfring
2017-01-19 9:50 ` Paolo Bonzini
@ 2017-01-19 11:13 ` kbuild test robot
1 sibling, 0 replies; 6+ messages in thread
From: kbuild test robot @ 2017-01-19 11:13 UTC (permalink / raw)
To: SF Markus Elfring
Cc: kbuild-all, kvm, linux-mips, James Hogan, Paolo Bonzini,
Radim Krčmář,
Ralf Bächle, LKML, kernel-janitors
[-- Attachment #1: Type: text/plain, Size: 2216 bytes --]
Hi Markus,
[auto build test ERROR on kvm/linux-next]
[also build test ERROR on v4.10-rc4 next-20170119]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
url: https://github.com/0day-ci/linux/commits/SF-Markus-Elfring/MIPS-KVM-Return-directly-after-a-failed-copy_from_user-in-kvm_arch_vcpu_ioctl/20170119-154855
base: https://git.kernel.org/pub/scm/virt/kvm/kvm.git linux-next
config: mips-malta_kvm_defconfig (attached as .config)
compiler: mipsel-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
make.cross ARCH=mips
All errors (new ones prefixed by >>):
arch/mips/kvm/mips.c: In function 'kvm_arch_vcpu_ioctl':
>> arch/mips/kvm/mips.c:1175:1: error: label 'out' defined but not used [-Werror=unused-label]
out:
^~~
cc1: all warnings being treated as errors
vim +/out +1175 arch/mips/kvm/mips.c
5fafd8748 arch/mips/kvm/mips.c James Hogan 2014-12-08 1169 break;
5fafd8748 arch/mips/kvm/mips.c James Hogan 2014-12-08 1170 }
669e846e6 arch/mips/kvm/kvm_mips.c Sanjay Lal 2012-11-21 1171 default:
4c73fb2b0 arch/mips/kvm/kvm_mips.c David Daney 2013-05-23 1172 r = -ENOIOCTLCMD;
669e846e6 arch/mips/kvm/kvm_mips.c Sanjay Lal 2012-11-21 1173 }
669e846e6 arch/mips/kvm/kvm_mips.c Sanjay Lal 2012-11-21 1174
669e846e6 arch/mips/kvm/kvm_mips.c Sanjay Lal 2012-11-21 @1175 out:
669e846e6 arch/mips/kvm/kvm_mips.c Sanjay Lal 2012-11-21 1176 return r;
669e846e6 arch/mips/kvm/kvm_mips.c Sanjay Lal 2012-11-21 1177 }
669e846e6 arch/mips/kvm/kvm_mips.c Sanjay Lal 2012-11-21 1178
:::::: The code at line 1175 was first introduced by commit
:::::: 669e846e6c4e13f16d7418973609931e362cb16a KVM/MIPS32: MIPS arch specific APIs for KVM
:::::: TO: Sanjay Lal <sanjayl@kymasys.com>
:::::: CC: Ralf Baechle <ralf@linux-mips.org>
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 18266 bytes --]
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH v2] MIPS: KVM: Return directly after a failed copy_from_user() in kvm_arch_vcpu_ioctl()
2017-01-19 10:27 ` Paolo Bonzini
@ 2017-01-19 12:08 ` James Hogan
0 siblings, 0 replies; 6+ messages in thread
From: James Hogan @ 2017-01-19 12:08 UTC (permalink / raw)
To: Paolo Bonzini
Cc: SF Markus Elfring, kvm, linux-mips, Radim Krčmář,
Ralf Bächle, LKML, kernel-janitors
[-- Attachment #1: Type: text/plain, Size: 1871 bytes --]
On Thu, Jan 19, 2017 at 11:27:52AM +0100, Paolo Bonzini wrote:
>
>
> On 19/01/2017 11:20, SF Markus Elfring wrote:
> > From: Markus Elfring <elfring@users.sourceforge.net>
> > Date: Thu, 19 Jan 2017 11:10:26 +0100
> >
> > * Return directly after a call of the function "copy_from_user" failed
> > in a case block.
> >
> > * Delete the jump label "out" which became unnecessary with
> > this refactoring.
> >
> > Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
> > ---
> >
> > V2:
> > A label was also removed at the end.
> >
> > arch/mips/kvm/mips.c | 9 ++-------
> > 1 file changed, 2 insertions(+), 7 deletions(-)
> >
> > diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
> > index 06a60b19acfb..3534a0b9efed 100644
> > --- a/arch/mips/kvm/mips.c
> > +++ b/arch/mips/kvm/mips.c
> > @@ -1152,10 +1152,8 @@ long kvm_arch_vcpu_ioctl(struct file *filp, unsigned int ioctl,
> > {
> > struct kvm_mips_interrupt irq;
> >
> > - r = -EFAULT;
> > if (copy_from_user(&irq, argp, sizeof(irq)))
> > - goto out;
> > -
> > + return -EFAULT;
> > kvm_debug("[%d] %s: irq: %d\n", vcpu->vcpu_id, __func__,
> > irq.irq);
> >
> > @@ -1165,17 +1163,14 @@ long kvm_arch_vcpu_ioctl(struct file *filp, unsigned int ioctl,
> > case KVM_ENABLE_CAP: {
> > struct kvm_enable_cap cap;
> >
> > - r = -EFAULT;
> > if (copy_from_user(&cap, argp, sizeof(cap)))
> > - goto out;
> > + return -EFAULT;
> > r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
> > break;
> > }
> > default:
> > r = -ENOIOCTLCMD;
> > }
> > -
> > -out:
> > return r;
> > }
> >
> >
>
> Removing the label makes the patch worthwhile.
>
> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Thanks Markus & Paolo. Looks better now. I'll apply for 4.11.
Cheers
James
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2017-01-18 19:52 [PATCH] MIPS: KVM: Return directly after a failed copy_from_user() in kvm_arch_vcpu_ioctl() SF Markus Elfring
2017-01-19 9:50 ` Paolo Bonzini
2017-01-19 10:20 ` [PATCH v2] " SF Markus Elfring
2017-01-19 10:27 ` Paolo Bonzini
2017-01-19 12:08 ` James Hogan
2017-01-19 11:13 ` [PATCH] " kbuild test robot
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