File 0188-prep-add-ppc-parity-write-method.patch of Package qemu.26284

From: Prasad J Pandit <pjp@fedoraproject.org>
Date: Tue, 11 Aug 2020 17:11:28 +0530
Subject: prep: add ppc-parity write method

Git-commit: f867cebaedbc9c43189f102e4cdfdff05e88df7f
References: bsc#1173612, CVE-2020-15469

Add ppc-parity mmio write method to avoid NULL pointer dereference
issue.

Reported-by: Lei Sun <slei.casper@gmail.com>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Reviewed-by: Li Qiang <liq3ea@gmail.com>
Message-Id: <20200811114133.672647-5-ppandit@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
 hw/ppc/prep_systemio.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/hw/ppc/prep_systemio.c b/hw/ppc/prep_systemio.c
index 50893ec5295ba0535f2e5b8d4df6..ce53cffdac036c074b8cd95992fd 100644
--- a/hw/ppc/prep_systemio.c
+++ b/hw/ppc/prep_systemio.c
@@ -23,6 +23,7 @@
  */
 
 #include "qemu/osdep.h"
+#include "qemu/log.h"
 #include "hw/isa/isa.h"
 #include "exec/address-spaces.h"
 #include "qemu/error-report.h" /* for error_report() */
@@ -231,8 +232,15 @@ static uint64_t ppc_parity_error_readl(void *opaque, hwaddr addr,
     return val;
 }
 
+static void ppc_parity_error_writel(void *opaque, hwaddr addr,
+                                    uint64_t data, unsigned size)
+{
+    qemu_log_mask(LOG_GUEST_ERROR, "%s: invalid access\n", __func__);
+}
+
 static const MemoryRegionOps ppc_parity_error_ops = {
     .read = ppc_parity_error_readl,
+    .write = ppc_parity_error_writel,
     .valid = {
         .min_access_size = 4,
         .max_access_size = 4,