File 5d77b40f-fix-hvm_all_ioreq_servers_add_vcpu-cleanup.patch of Package xen.12874

# Commit 215f2576b0ac1bc18f3ff74e34f0d8379bda9040
# Date 2019-09-10 16:32:47 +0200
# Author Roger Pau Monné <roger.pau@citrix.com>
# Committer Jan Beulich <jbeulich@suse.com>
ioreq: fix hvm_all_ioreq_servers_add_vcpu fail path cleanup

The loop in FOR_EACH_IOREQ_SERVER is backwards hence the cleanup on
failure needs to be done forwards.

Fixes: 97a5a3e30161 ('x86/hvm/ioreq: maintain an array of ioreq servers rather than a list')
Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Paul Durrant <paul.durrant@citrix.com>

--- a/xen/arch/x86/hvm/ioreq.c
+++ b/xen/arch/x86/hvm/ioreq.c
@@ -1202,7 +1202,7 @@ int hvm_all_ioreq_servers_add_vcpu(struc
     return 0;
 
  fail:
-    while ( id-- != 0 )
+    while ( ++id != MAX_NR_IOREQ_SERVERS )
     {
         s = GET_IOREQ_SERVER(d, id);