xserver: Branch 'master'

[GitLab Mirror]

 Xi/exevents.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

New commits:
commit 0ba6d8c37071131a49790243cdac55392ecf71ec
Author: Peter Hutterer <peter.hutterer at who-t.net>
Date:   Wed Jan 25 11:41:40 2023 +1000

    Xi: fix potential use-after-free in DeepCopyPointerClasses
    
    CVE-2023-0494, ZDI-CAN-19596
    
    This vulnerability was discovered by:
    Jan-Niklas Sohn working with Trend Micro Zero Day Initiative
    
    Signed-off-by: Peter Hutterer <peter.hutterer at who-t.net>

diff --git a/Xi/exevents.c b/Xi/exevents.c
index 217baa956..dcd4efb3b 100644
--- a/Xi/exevents.c
+++ b/Xi/exevents.c
@@ -619,8 +619,10 @@ DeepCopyPointerClasses(DeviceIntPtr from, DeviceIntPtr to)
             memcpy(to->button->xkb_acts, from->button->xkb_acts,
                    sizeof(XkbAction));
         }
-        else
+        else {
             free(to->button->xkb_acts);
+            to->button->xkb_acts = NULL;
+        }
 
         memcpy(to->button->labels, from->button->labels,
                from->button->numButtons * sizeof(Atom));