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usb: check USB configuration descriptor object

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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 <luodalongde@gmail.com>
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Message-id: 1455188480-14688-1-git-send-email-ppandit@redhat.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Prasad J Pandit 2016-02-11 16:31:20 +05:30 committed by Gerd Hoffmann
parent 8eb779e422
commit 80eecda8e5
1 changed files with 2 additions and 1 deletions
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3
hw/usb/dev-network.c
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@ -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,