[xen stable-4.18] x86/mem_sharing: Release domain if we are not able to enable memory sharing

[patchbot@xxxxxxx]

commit 90a6d821757edf1202c527143b8a05b0d2a3dfaa
Author:     Frediano Ziglio <frediano.ziglio@xxxxxxxxx>
AuthorDate: Wed Dec 6 10:37:13 2023 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Dec 6 10:37:13 2023 +0100

    x86/mem_sharing: Release domain if we are not able to enable memory sharing
    
    In case it's not possible to enable memory sharing (mem_sharing_control
    fails) we just return the error code without releasing the domain
    acquired some lines above by rcu_lock_live_remote_domain_by_id().
    
    Fixes: 72f8d45d69b8 ("x86/mem_sharing: enable mem_sharing on first memop")
    Signed-off-by: Frediano Ziglio <frediano.ziglio@xxxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Acked-by: Tamas K Lengyel <tamas@xxxxxxxxxxxxx>
    master commit: fbcec32d6d3ea0ac329301925b317478316209ed
    master date: 2023-11-27 12:06:13 +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 142258f16a..429d27ef85 100644
--- a/xen/arch/x86/mm/mem_sharing.c
+++ b/xen/arch/x86/mm/mem_sharing.c
@@ -2013,7 +2013,7 @@ int 
mem_sharing_memop(XEN_GUEST_HANDLE_PARAM(xen_mem_sharing_op_t) arg)
 
     if ( !mem_sharing_enabled(d) &&
          (rc = mem_sharing_control(d, true, 0)) )
-        return rc;
+        goto out;
 
     switch ( mso.op )
     {
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.18