From e37cc4812282c42a304cde9d83a236f5ac1f26a7 Mon Sep 17 00:00:00 2001 From: Prasad J Pandit Date: Thu, 11 Feb 2016 16:31:20 +0530 Subject: usb: check USB configuration descriptor object When processing remote NDIS control message packets, the USB Net device emulator checks to see if the USB configuration descriptor object is of RNDIS type(2). But it does not check if it is null, which leads to a null dereference error. Add check to avoid it. Reported-by: Qinghao Tang Signed-off-by: Prasad J Pandit Message-id: 1455188480-14688-1-git-send-email-ppandit@redhat.com Signed-off-by: Gerd Hoffmann --- hw/usb/dev-network.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/hw/usb/dev-network.c b/hw/usb/dev-network.c index 985a629..5dc4538 100644 --- a/hw/usb/dev-network.c +++ b/hw/usb/dev-network.c @@ -654,7 +654,8 @@ typedef struct USBNetState { static int is_rndis(USBNetState *s) { - return s->dev.config->bConfigurationValue == DEV_RNDIS_CONFIG_VALUE; + return s->dev.config ? + s->dev.config->bConfigurationValue == DEV_RNDIS_CONFIG_VALUE : 0; } static int ndis_query(USBNetState *s, uint32_t oid, -- cgit v1.1