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

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In musb_packet(), the call to usb_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().  This then
allows the subsequent calculation of 'id' to be streamlined.

Signed-off-by: Liam Merwick <liam.merwick@oracle.com>
Message-id: 1549460216-25808-8-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 13:36:54 +00:00 committed by Gerd Hoffmann
parent ff668537b6
commit e87fd1e6e5
1 changed files with 4 additions and 4 deletions
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8
hw/usb/hcd-musb.c
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@ -628,11 +628,11 @@ static void musb_packet(MUSBState *s, MUSBEndPoint *ep,
/* A wild guess on the FADDR semantics... */
dev = usb_find_device(&s->port, ep->faddr[idx]);
uep = usb_ep_get(dev, pid, ep->type[idx] & 0xf);
id = pid;
if (uep) {
id |= (dev->addr << 16) | (uep->nr << 8);
if (dev == NULL) {
return;
}
uep = usb_ep_get(dev, pid, ep->type[idx] & 0xf);
id = pid | (dev->addr << 16) | (uep->nr << 8);
usb_packet_setup(&ep->packey[dir].p, pid, uep, 0, id, false, true);
usb_packet_addbuf(&ep->packey[dir].p, ep->buf[idx], len);
ep->packey[dir].ep = ep;