From: Roger Pau Monné <roger.pau@citrix.com>
Date: Mon, 23 Sep 2019 12:42:13 +0000 (+0200)
Subject: ioreq: fix hvm_all_ioreq_servers_add_vcpu fail path cleanup
X-Git-Tag: archive/raspbian/4.11.3+24-g14b62ab3e5-1+rpi1^2~55^2~102
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=b2220461a3081d23ed9c36dc053161d58655da97;p=xen.git

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>
master commit: 215f2576b0ac1bc18f3ff74e34f0d8379bda9040
master date: 2019-09-10 16:32:47 +0200
---

diff --git a/xen/arch/x86/hvm/ioreq.c b/xen/arch/x86/hvm/ioreq.c
index ac05875af1..f95fb18c1f 100644
--- a/xen/arch/x86/hvm/ioreq.c
+++ b/xen/arch/x86/hvm/ioreq.c
@@ -1246,7 +1246,7 @@ int hvm_all_ioreq_servers_add_vcpu(struct domain *d, struct vcpu *v)
     return 0;
 
  fail:
-    while ( id-- != 0 )
+    while ( ++id != MAX_NR_IOREQ_SERVERS )
     {
         s = GET_IOREQ_SERVER(d, id);