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uhci: check device is not NULL before calling usb_ep_get()

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In uhci_handle_td(), the call to ehci_find_device() can return NULL
if it doesn't find a device matching 'addr' so explicitly check
the return value before passing it to usb_ep_get().

Signed-off-by: Liam Merwick <liam.merwick@oracle.com>
Message-id: 1549460216-25808-7-git-send-email-liam.merwick@oracle.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Liam Merwick 2019-02-06 13:36:53 +00:00 committed by Gerd Hoffmann
parent 42340fc31f
commit ff668537b6
1 changed files with 5 additions and 3 deletions
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8
hw/usb/hcd-uhci.c
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@ -858,13 +858,15 @@ static int uhci_handle_td(UHCIState *s, UHCIQueue *q, uint32_t qh_addr,
/* Allocate new packet */
if (q == NULL) {
USBDevice *dev = uhci_find_device(s, (td->token >> 8) & 0x7f);
USBEndpoint *ep = usb_ep_get(dev, pid, (td->token >> 15) & 0xf);
USBDevice *dev;
USBEndpoint *ep;
if (ep == NULL) {
dev = uhci_find_device(s, (td->token >> 8) & 0x7f);
if (dev == NULL) {
return uhci_handle_td_error(s, td, td_addr, USB_RET_NODEV,
int_mask);
}
ep = usb_ep_get(dev, pid, (td->token >> 15) & 0xf);
q = uhci_queue_new(s, qh_addr, td, ep);
}
async = uhci_async_alloc(q, td_addr);