e.g.
$qemu-system-x86_64 -device port92
will report segment fault,
for port92_write try a un-allocated
assignment for a20_out.
so check before this assignment.
Signed-off-by: liguang <lig.f...@cn.fujitsu.com>
---
hw/i386/pc.c | 4 +++-
1 files changed, 3 insertions(+), 1 deletions(-)
diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index 09fb728..b881314 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -444,7 +444,9 @@ static void port92_write(void *opaque, hwaddr addr,
uint64_t val,
DPRINTF("port92: write 0x%02x\n", val);
s->outport = val;
- qemu_set_irq(*s->a20_out, (val >> 1) & 1);
+ if (s->a20_out) {
+ qemu_set_irq(*s->a20_out, (val >> 1) & 1);
+ }
if (val & 1) {
qemu_system_reset_request();
}
--
1.7.2.5
