From e87fd1e6e547a80b3e403e882b829d2750e24e44 Mon Sep 17 00:00:00 2001 From: Liam Merwick Date: Wed, 6 Feb 2019 13:36:54 +0000 Subject: [PATCH] usb: check device is not NULL before calling usb_ep_get() 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 Message-id: 1549460216-25808-8-git-send-email-liam.merwick@oracle.com Signed-off-by: Gerd Hoffmann --- hw/usb/hcd-musb.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/hw/usb/hcd-musb.c b/hw/usb/hcd-musb.c index d70a91a58c..85d7796554 100644 --- a/hw/usb/hcd-musb.c +++ b/hw/usb/hcd-musb.c @@ -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;