[PATCH 09/27] hw/usb/dev-smartcard-reader: validate migrated fields in post_load

Validate fields loaded from the migration stream to reject crafted or
corrupt data before it can cause harm.

Signed-off-by: Marc-André Lureau <[email protected]>
---
 hw/usb/dev-smartcard-reader.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/hw/usb/dev-smartcard-reader.c b/hw/usb/dev-smartcard-reader.c
index c6a9faf00d6f..bed641be4512 100644
--- a/hw/usb/dev-smartcard-reader.c
+++ b/hw/usb/dev-smartcard-reader.c
@@ -1364,6 +1364,26 @@ static void ccid_realize(USBDevice *dev, Error **errp)
 static int ccid_post_load(void *opaque, int version_id)
 {
     USBCCIDState *s = opaque;
+    int i;
+
+    if (s->bulk_in_pending_end - s->bulk_in_pending_start > BULK_IN_PENDING_NUM) {
+        return -EINVAL;
+    }
+
+    if (s->pending_answers_num > PENDING_ANSWERS_NUM) {
+        return -EINVAL;
+    }
+
+    if (s->bulk_out_pos > BULK_OUT_DATA_SIZE) {
+        return -EINVAL;
+    }
+
+    for (i = 0; i < BULK_IN_PENDING_NUM; i++) {
+        if (s->bulk_in_pending[i].len > BULK_IN_BUF_SIZE ||
+            s->bulk_in_pending[i].pos > s->bulk_in_pending[i].len) {
+            return -EINVAL;
+        }
+    }
 
     /*
      * This must be done after usb_device_attach, which sets state to ATTACHED,

-- 
2.55.0