[xen stable-4.14] x86/mem_sharing: fix uninitialized 'preempted' variable

[patchbot@xxxxxxx]

commit 9028fd493a69b1e216239542d986240fa1ea7167
Author:     Tamas K Lengyel <tamas@xxxxxxxxxxxxx>
AuthorDate: Thu Jan 21 16:20:27 2021 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Jan 21 16:20:27 2021 +0100

    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>
    master commit: cb34a2fa162184b150d48a3b6f385bacbec22ce7
    master date: 2021-01-18 17:50:11 +0000
---
 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 c428fd16ce..468bbcfa67 100644
--- a/xen/arch/x86/mm/mem_sharing.c
+++ b/xen/arch/x86/mm/mem_sharing.c
@@ -1628,7 +1628,7 @@ 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#stable-4.14