[xen stable-4.14] xen/memory: Fix compat XENMEM_acquire_resource for size requests

[patchbot@xxxxxxx]

commit 7f99c05ded1999e9cf85a9d1f3586dfa45daa531
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Thu Jan 21 16:20:00 2021 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Jan 21 16:20:00 2021 +0100

    xen/memory: Fix compat XENMEM_acquire_resource for size requests
    
    Copy the nr_frames from the structure which actually has the correct value, 
so
    the caller doesn't unconditionally receive 0.
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Reviewed-by: Paul Durrant <paul@xxxxxxx>
    master commit: 414be7b66349e7dca42bc1fd47c2b2f5b2d27432
    master date: 2021-01-12 18:17:02 +0000
---
 xen/common/compat/memory.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/common/compat/memory.c b/xen/common/compat/memory.c
index 3851f756c7..ed92e05b08 100644
--- a/xen/common/compat/memory.c
+++ b/xen/common/compat/memory.c
@@ -599,7 +599,7 @@ int compat_memory_op(unsigned int cmd, 
XEN_GUEST_HANDLE_PARAM(void) compat)
                 if ( __copy_field_to_guest(
                          guest_handle_cast(compat,
                                            compat_mem_acquire_resource_t),
-                         &cmp.mar, nr_frames) )
+                         nat.mar, nr_frames) )
                     return -EFAULT;
             }
             else
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.14