qemu: Security fix CVE-2016-2198

CVE-2016-2198 Qemu: usb: ehci null pointer dereference in ehci_caps_write

(From OE-Core rev: 646a8cfa5398a22062541ba9c98539180ba85d58)

Signed-off-by: Armin Kuster <akuster@mvista.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/qemu/qemu/CVE-2016-2198.patch

+From: Prasad J Pandit <address@hidden>
+
+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 <address@hidden>
+Signed-off-by: Prasad J Pandit <address@hidden>
+
+Upstream-Status: Backport
+https://lists.gnu.org/archive/html/qemu-devel/2016-01/msg05899.html
+
+CVE: CVE-2016-2198
+Signed-off-by: Armin Kuster <akuster@mvista.com>
+
+---
+ hw/usb/hcd-ehci.c | 6 ++++++
+  1 file changed, 6 insertions(+)
+
+Index: qemu-2.5.0/hw/usb/hcd-ehci.c
+===================================================================
+--- qemu-2.5.0.orig/hw/usb/hcd-ehci.c
++++ qemu-2.5.0/hw/usb/hcd-ehci.c
+@@ -893,6 +893,11 @@ static uint64_t ehci_caps_read(void *ptr
+     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)
+ {
+@@ -2310,6 +2315,7 @@ static void ehci_frame_timer(void *opaqu
+ 
+ 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,

meta/recipes-devtools/qemu/qemu_2.4.0.bb

@@ -19,6 +19,7 @@ SRC_URI += "file://configure-fix-Darwin-target-detection.patch \
             file://CVE-2015-7295_2.patch \
             file://CVE-2015-7295_3.patch \
             file://CVE-2016-2197.patch \
+            file://CVE-2016-2198.patch \
            "
 SRC_URI_prepend = "http://wiki.qemu-project.org/download/${BP}.tar.bz2"
 SRC_URI[md5sum] = "186ee8194140a484a455f8e3c74589f4"