[xen stable-4.11] x86/shadow: correct an inverted conditional in dirty VRAM tracking

[patchbot@xxxxxxx]

commit a3a392ef21ee562cead19d6fe34ac260aa9c0788
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Tue Jul 7 15:19:40 2020 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Jul 7 15:19:40 2020 +0200

    x86/shadow: correct an inverted conditional in dirty VRAM tracking
    
    This originally was "mfn_x(mfn) == INVALID_MFN". Make it like this
    again, taking the opportunity to also drop the unnecessary nearby
    braces.
    
    This is XSA-319.
    
    Fixes: 246a5a3377c2 ("xen: Use a typesafe to define INVALID_MFN")
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    master commit: 23a216f99d40fbfbc2318ade89d8213eea6ba1f8
    master date: 2020-07-07 14:36:24 +0200
---
 xen/arch/x86/mm/shadow/common.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/xen/arch/x86/mm/shadow/common.c b/xen/arch/x86/mm/shadow/common.c
index 34913c1ade..0b8682d7a9 100644
--- a/xen/arch/x86/mm/shadow/common.c
+++ b/xen/arch/x86/mm/shadow/common.c
@@ -3881,10 +3881,8 @@ int shadow_track_dirty_vram(struct domain *d,
             int dirty = 0;
             paddr_t sl1ma = dirty_vram->sl1ma[i];
 
-            if ( !mfn_eq(mfn, INVALID_MFN) )
-            {
+            if ( mfn_eq(mfn, INVALID_MFN) )
                 dirty = 1;
-            }
             else
             {
                 page = mfn_to_page(mfn);
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.11