The console_select() function does not check that active_console is
non-NULL before dereferencing it. When invoked with qemu -nodefaults it
is possible to hit this case.
This patch checks that active_console is non-NULL before stashing away
the old console dimensions in console_select().
Signed-off-by: Stefan Hajnoczi <stefa...@linux.vnet.ibm.com>
---
console.c | 6 ++++--
1 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/console.c b/console.c
index 698bc10..c1728b1 100644
--- a/console.c
+++ b/console.c
@@ -1060,8 +1060,10 @@ void console_select(unsigned int index)
if (index >= MAX_CONSOLES)
return;
- active_console->g_width = ds_get_width(active_console->ds);
- active_console->g_height = ds_get_height(active_console->ds);
+ if (active_console) {
+ active_console->g_width = ds_get_width(active_console->ds);
+ active_console->g_height = ds_get_height(active_console->ds);
+ }
s = consoles[index];
if (s) {
DisplayState *ds = s->ds;
--
1.7.1
