[xen stable-4.12] x86/vLAPIC: don't leak regs page from vlapic_init() upon error

[patchbot@xxxxxxx]

commit 7488b405b4b35540d99e938975fb8f10079b652b
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Tue Oct 20 15:05:29 2020 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Oct 20 15:05:29 2020 +0200

    x86/vLAPIC: don't leak regs page from vlapic_init() upon error
    
    Fixes: 8a981e0bf25e ("Make map_domain_page_global fail")
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    master commit: 8a62dee9ceff3056c7e0bd9632bac39bee2a51b3
    master date: 2020-10-09 17:20:11 +0100
---
 xen/arch/x86/hvm/vlapic.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/xen/arch/x86/hvm/vlapic.c b/xen/arch/x86/hvm/vlapic.c
index f12fe976cd..393255d555 100644
--- a/xen/arch/x86/hvm/vlapic.c
+++ b/xen/arch/x86/hvm/vlapic.c
@@ -1608,6 +1608,7 @@ int vlapic_init(struct vcpu *v)
         vlapic->regs = __map_domain_page_global(vlapic->regs_page);
         if ( vlapic->regs == NULL )
         {
+            free_domheap_page(vlapic->regs_page);
             dprintk(XENLOG_ERR, "map vlapic regs error: %d/%d\n",
                     v->domain->domain_id, v->vcpu_id);
             return -ENOMEM;
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.12