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[Qemu-devel] [PATCH v2 7/9] usb: check device is not NULL before calling
From: |
Liam Merwick |
Subject: |
[Qemu-devel] [PATCH v2 7/9] usb: check device is not NULL before calling usb_ep_get() |
Date: |
Wed, 6 Feb 2019 13:36:54 +0000 |
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 <address@hidden>
---
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 d70a91a58ce2..85d779655498 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;
--
1.8.3.1
- [Qemu-devel] [PATCH v2 0/9] Dealing with Null devices in usb_ep_get(), Liam Merwick, 2019/02/06
- [Qemu-devel] [PATCH v2 1/9] usb: rearrange usb_ep_get(), Liam Merwick, 2019/02/06
- [Qemu-devel] [PATCH v2 5/9] ohci: check device is not NULL before calling usb_ep_get(), Liam Merwick, 2019/02/06
- [Qemu-devel] [PATCH v2 2/9] xhci: add asserts to help with static code analysis, Liam Merwick, 2019/02/06
- [Qemu-devel] [PATCH v2 3/9] xhci: check device is not NULL before calling usb_ep_get(), Liam Merwick, 2019/02/06
- [Qemu-devel] [PATCH v2 4/9] ehci: check device is not NULL before calling usb_ep_get(), Liam Merwick, 2019/02/06
- [Qemu-devel] [PATCH v2 8/9] usb: add device checks before redirector calls to usb_ep_get(), Liam Merwick, 2019/02/06
- [Qemu-devel] [PATCH v2 6/9] uhci: check device is not NULL before calling usb_ep_get(), Liam Merwick, 2019/02/06
- [Qemu-devel] [PATCH v2 7/9] usb: check device is not NULL before calling usb_ep_get(),
Liam Merwick <=
- [Qemu-devel] [PATCH v2 9/9] usb: remove unnecessary NULL device check from usb_ep_get(), Liam Merwick, 2019/02/06
- Re: [Qemu-devel] [PATCH v2 0/9] Dealing with Null devices in usb_ep_get(), Gerd Hoffmann, 2019/02/08