[xen staging] x86/mem_sharing: fix uninitialized 'preempted' variable

[patchbot@xxxxxxx]

commit cb34a2fa162184b150d48a3b6f385bacbec22ce7
Author:     Tamas K Lengyel <tamas@xxxxxxxxxxxxx>
AuthorDate: Mon Jan 18 10:23:06 2021 -0700
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Mon Jan 18 17:50:11 2021 +0000

    x86/mem_sharing: fix uninitialized 'preempted' variable
    
    UBSAN catches an uninitialized use of the 'preempted' variable in
    fork_hap_allocation when there is no preemption.
    
    Fixes: 41548c5472a ("mem_sharing: VM forking")
    Signed-off-by: Tamas K Lengyel <tamas@xxxxxxxxxxxxx>
    Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/arch/x86/mm/mem_sharing.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/arch/x86/mm/mem_sharing.c b/xen/arch/x86/mm/mem_sharing.c
index c8a6d11b90..adaeab4612 100644
--- a/xen/arch/x86/mm/mem_sharing.c
+++ b/xen/arch/x86/mm/mem_sharing.c
@@ -1644,7 +1644,7 @@ static int copy_vcpu_settings(struct domain *cd, const 
struct domain *d)
 static int fork_hap_allocation(struct domain *cd, struct domain *d)
 {
     int rc;
-    bool preempted;
+    bool preempted = false;
     unsigned long mb = hap_get_allocation(d);
 
     if ( mb == hap_get_allocation(cd) )
--
generated by git-patchbot for /home/xen/git/xen.git#staging