qemu/0718-ehci-Don-t-access-packet-after-freeing-it.patch

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From 9c8576aeca2d65e17748dc137f0e9abeb2959604 Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Wed, 14 Nov 2012 16:21:36 +0000
Subject: [PATCH 718/719] ehci: Don't access packet after freeing it
ehci_state_writeback() will free the packet, so we should not access
the packet after calling ehci_state_writeback().
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from 30d68cf6e156b97fc462e18f38ce83f44702cd7f)
---
hw/usb/hcd-ehci.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/hw/usb/hcd-ehci.c b/hw/usb/hcd-ehci.c
index 46f6d99..4229061 100644
--- a/hw/usb/hcd-ehci.c
+++ b/hw/usb/hcd-ehci.c
@@ -752,12 +752,13 @@ static EHCIPacket *ehci_alloc_packet(EHCIQueue *q)
static void ehci_free_packet(EHCIPacket *p)
{
if (p->async == EHCI_ASYNC_FINISHED) {
- int state = ehci_get_state(p->queue->ehci, p->queue->async);
+ EHCIQueue *q = p->queue;
+ int state = ehci_get_state(q->ehci, q->async);
/* This is a normal, but rare condition (cancel racing completion) */
fprintf(stderr, "EHCI: Warning packet completed but not processed\n");
- ehci_state_executing(p->queue);
- ehci_state_writeback(p->queue);
- ehci_set_state(p->queue->ehci, p->queue->async, state);
+ ehci_state_executing(q);
+ ehci_state_writeback(q);
+ ehci_set_state(q->ehci, q->async, state);
/* state_writeback recurses into us with async == EHCI_ASYNC_NONE!! */
return;
}
--
1.8.1.4