File 0227-usb-ehci-add-capability-mmio-write-.patch of Package qemu-linux-user.2059

From 5d334055c47544c00c87da52f785d7eee5d27342 Mon Sep 17 00:00:00 2001
From: Prasad J Pandit <pjp@fedoraproject.org>
Date: Fri, 29 Jan 2016 06:01:00 -0700
Subject: [PATCH] usb: ehci: add capability mmio write function

USB Ehci emulation supports host controller capability registers.
But its mmio '.write' function was missing, which lead to a null
pointer dereference issue. Add a do nothing 'ehci_caps_write'
definition to avoid it; Do nothing because capability registers
are Read Only(RO).

Reported-by: Zuozhi Fzz <zuozhi.fzz@alibaba-inc.com>
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
[BR: BSC#964413 CVE-2016-2198]
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
 hw/usb/hcd-ehci.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/hw/usb/hcd-ehci.c b/hw/usb/hcd-ehci.c
index 2ad58da..b29dc56 100644
--- a/hw/usb/hcd-ehci.c
+++ b/hw/usb/hcd-ehci.c
@@ -976,6 +976,11 @@ static uint64_t ehci_caps_read(void *ptr, hwaddr addr,
     return s->caps[addr];
 }
 
+static void ehci_caps_write(void *ptr, hwaddr addr,
+                             uint64_t val, unsigned size)
+{
+}
+
 static uint64_t ehci_opreg_read(void *ptr, hwaddr addr,
                                 unsigned size)
 {
@@ -2397,6 +2402,7 @@ static void ehci_frame_timer(void *opaque)
 
 static const MemoryRegionOps ehci_mmio_caps_ops = {
     .read = ehci_caps_read,
+    .write = ehci_caps_write,
     .valid.min_access_size = 1,
     .valid.max_access_size = 4,
     .impl.min_access_size = 1,