[qemu-xen stable-4.18] ui: fix crash when there are no active_console

[patchbot@xxxxxxx]

commit 6c575436cd3e692079fc3e2fe4f54efe77211549
Author:     Marc-André Lureau <marcandre.lureau@xxxxxxxxxx>
AuthorDate: Mon Sep 11 18:04:47 2023 +0400
Commit:     Michael Tokarev <mjt@xxxxxxxxxx>
CommitDate: Wed Sep 20 10:18:14 2023 +0300

    ui: fix crash when there are no active_console
    
    Thread 1 "qemu-system-x86" received signal SIGSEGV, Segmentation fault.
    0x0000555555888630 in dpy_ui_info_supported (con=0x0) at ../ui/console.c:812
    812         return con->hw_ops->ui_info != NULL;
    (gdb) bt
    #0  0x0000555555888630 in dpy_ui_info_supported (con=0x0) at 
../ui/console.c:812
    #1  0x00005555558a44b1 in protocol_client_msg (vs=0x5555578c76c0, 
data=0x5555581e93f0 <incomplete sequence \373>, len=24) at ../ui/vnc.c:2585
    #2  0x00005555558a19ac in vnc_client_read (vs=0x5555578c76c0) at 
../ui/vnc.c:1607
    #3  0x00005555558a1ac2 in vnc_client_io (ioc=0x5555581eb0e0, 
condition=G_IO_IN, opaque=0x5555578c76c0) at ../ui/vnc.c:1635
    
    Fixes:
    https://issues.redhat.com/browse/RHEL-2600
    
    Signed-off-by: Marc-André Lureau <marcandre.lureau@xxxxxxxxxx>
    Reviewed-by: Albert Esteve <aesteve@xxxxxxxxxx>
    (cherry picked from commit 48a35e12faf90a896c5aa4755812201e00d60316)
    Signed-off-by: Michael Tokarev <mjt@xxxxxxxxxx>
---
 ui/console.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/ui/console.c b/ui/console.c
index 7461446e71..a327c9f94a 100644
--- a/ui/console.c
+++ b/ui/console.c
@@ -1707,6 +1707,9 @@ bool dpy_ui_info_supported(QemuConsole *con)
     if (con == NULL) {
         con = active_console;
     }
+    if (con == NULL) {
+        return false;
+    }
 
     return con->hw_ops->ui_info != NULL;
 }
--
generated by git-patchbot for /home/xen/git/qemu-xen.git#stable-4.18