File 0187-vfio-add-quirk-device-write-method.patch of Package qemu.19806

From: Prasad J Pandit <pjp@fedoraproject.org>
Date: Tue, 11 Aug 2020 17:11:27 +0530
Subject: vfio: add quirk device write method

Git-commit: 24202d2b561c3b4c48bd28383c8c34b4ac66c2bf
References: bsc#1173612, CVE-2020-15469

Add vfio quirk device mmio write method to avoid NULL pointer
dereference issue.

Reported-by: Lei Sun <slei.casper@gmail.com>
Reviewed-by: Li Qiang <liq3ea@gmail.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Acked-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Message-Id: <20200811114133.672647-4-ppandit@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
 hw/vfio/pci-quirks.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/hw/vfio/pci-quirks.c b/hw/vfio/pci-quirks.c
index eae31c74d69f60798d590d7764c2..03b93d1b38e272972f674d373c2d 100644
--- a/hw/vfio/pci-quirks.c
+++ b/hw/vfio/pci-quirks.c
@@ -12,6 +12,7 @@
 
 #include "qemu/osdep.h"
 #include "qemu/units.h"
+#include "qemu/log.h"
 #include "qemu/error-report.h"
 #include "qemu/main-loop.h"
 #include "qemu/range.h"
@@ -274,8 +275,15 @@ static uint64_t vfio_ati_3c3_quirk_read(void *opaque,
     return data;
 }
 
+static void vfio_ati_3c3_quirk_write(void *opaque, hwaddr addr,
+                                        uint64_t data, unsigned size)
+{
+    qemu_log_mask(LOG_GUEST_ERROR, "%s: invalid access\n", __func__);
+}
+
 static const MemoryRegionOps vfio_ati_3c3_quirk = {
     .read = vfio_ati_3c3_quirk_read,
+    .write = vfio_ati_3c3_quirk_write,
     .endianness = DEVICE_LITTLE_ENDIAN,
 };