usb-linux: Refuse iso packets when max packet size is 0 (alt setting 0)
Refuse iso usb packets when then max packet size for the endpoint is 0,
this avoids an abort in usb_host_alloc_iso() caused by trying to qemu_malloc
a 0 bytes large buffer.
diff --git a/usb-linux.c b/usb-linux.c
index 6aef7a5..4c42fe1 100644
--- a/usb-linux.c
+++ b/usb-linux.c
@@ -549,7 +549,11 @@
static int usb_host_handle_iso_data(USBHostDevice *s, USBPacket *p)
{
AsyncURB *aurb;
- int i, j, ret, len = 0;
+ int i, j, ret, max_packet_size, len = 0;
+
+ max_packet_size = get_max_packet_size(s, p->devep);
+ if (max_packet_size == 0)
+ return USB_RET_NAK;
aurb = get_iso_urb(s, p->devep);
if (!aurb) {
