[PATCH] kvm_main: Use common error handling code in kvm_dev_ioctl_create_vm()

[PATCH] kvm_main: Use common error handling code in kvm_dev_ioctl_create_vm()

[SF Markus Elfring]

From: Markus Elfring <elfring@users.sourceforge.net>
Date: Tue, 21 Nov 2017 13:40:17 +0100

Add a jump target so that a bit of exception handling can be better reused
at the end of this function.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
---
 virt/kvm/kvm_main.c | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 39e4db469f2e..c84341c79955 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -3155,21 +3155,18 @@ static int kvm_dev_ioctl_create_vm(unsigned long type)
 		return PTR_ERR(kvm);
 #ifdef CONFIG_KVM_MMIO
 	r = kvm_coalesced_mmio_init(kvm);
-	if (r < 0) {
-		kvm_put_kvm(kvm);
-		return r;
-	}
+	if (r < 0)
+		goto put_kvm;
 #endif
 	r = get_unused_fd_flags(O_CLOEXEC);
-	if (r < 0) {
-		kvm_put_kvm(kvm);
-		return r;
-	}
+	if (r < 0)
+		goto put_kvm;
+
 	file = anon_inode_getfile("kvm-vm", &kvm_vm_fops, kvm, O_RDWR);
 	if (IS_ERR(file)) {
 		put_unused_fd(r);
-		kvm_put_kvm(kvm);
-		return PTR_ERR(file);
+		r = PTR_ERR(file);
+		goto put_kvm;
 	}
 
 	/*
@@ -3187,6 +3184,10 @@ static int kvm_dev_ioctl_create_vm(unsigned long type)
 
 	fd_install(r, file);
 	return r;
+
+put_kvm:
+	kvm_put_kvm(kvm);
+	return r;
 }
 
 static long kvm_dev_ioctl(struct file *filp,
-- 
2.15.0

Re: [PATCH] kvm_main: Use common error handling code in kvm_dev_ioctl_create_vm()

[Paolo Bonzini]

On 21/11/2017 13:46, SF Markus Elfring wrote:
> From: Markus Elfring <elfring@users.sourceforge.net>
> Date: Tue, 21 Nov 2017 13:40:17 +0100
> 
> Add a jump target so that a bit of exception handling can be better reused
> at the end of this function.
> 
> This issue was detected by using the Coccinelle software.
> 
> Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
> ---
>  virt/kvm/kvm_main.c | 21 +++++++++++----------
>  1 file changed, 11 insertions(+), 10 deletions(-)
> 
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index 39e4db469f2e..c84341c79955 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -3155,21 +3155,18 @@ static int kvm_dev_ioctl_create_vm(unsigned long type)
>  		return PTR_ERR(kvm);
>  #ifdef CONFIG_KVM_MMIO
>  	r = kvm_coalesced_mmio_init(kvm);
> -	if (r < 0) {
> -		kvm_put_kvm(kvm);
> -		return r;
> -	}
> +	if (r < 0)
> +		goto put_kvm;
>  #endif
>  	r = get_unused_fd_flags(O_CLOEXEC);
> -	if (r < 0) {
> -		kvm_put_kvm(kvm);
> -		return r;
> -	}
> +	if (r < 0)
> +		goto put_kvm;
> +
>  	file = anon_inode_getfile("kvm-vm", &kvm_vm_fops, kvm, O_RDWR);
>  	if (IS_ERR(file)) {
>  		put_unused_fd(r);
> -		kvm_put_kvm(kvm);
> -		return PTR_ERR(file);
> +		r = PTR_ERR(file);
> +		goto put_kvm;
>  	}
>  
>  	/*
> @@ -3187,6 +3184,10 @@ static int kvm_dev_ioctl_create_vm(unsigned long type)
>  
>  	fd_install(r, file);
>  	return r;
> +
> +put_kvm:
> +	kvm_put_kvm(kvm);
> +	return r;
>  }
>  
>  static long kvm_dev_ioctl(struct file *filp,
> 

Queued, thanks.

Paolo