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[PATCH] Arm/domctl: correct XEN_DOMCTL_vuart_op error return value
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 26 Mar 2025 12:39:47 +0100
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- Cc: Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>
- Delivery-date: Wed, 26 Mar 2025 11:39:51 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
copy_to_guest() returns the number of bytes not copied; that's not what
the function should return to its caller though. Convert to returning
-EFAULT instead.
Fixes: 86039f2e8c20 ("xen/arm: vpl011: Add a new domctl API to initialize
vpl011")
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
--- a/xen/arch/arm/domctl.c
+++ b/xen/arch/arm/domctl.c
@@ -172,8 +172,8 @@ long arch_do_domctl(struct xen_domctl *d
break;
}
- if ( !rc )
- rc = copy_to_guest(u_domctl, domctl, 1);
+ if ( !rc && copy_to_guest(u_domctl, domctl, 1) )
+ rc = -EFAULT;
return rc;
}
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