[Qemu-devel] [PATCH] audio/hda: fix guest triggerable assert

[Gerd Hoffmann <kraxel@redhat.com>]

Guest writes to a readonly register trigger the assert in
intel_hda_reg_write().  Add a check and just ignore them.

Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=1628433
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 hw/audio/intel-hda.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/hw/audio/intel-hda.c b/hw/audio/intel-hda.c
index 23a2cf6484..066532713c 100644
--- a/hw/audio/intel-hda.c
+++ b/hw/audio/intel-hda.c
@@ -929,6 +929,10 @@ static void intel_hda_reg_write(IntelHDAState *d, const IntelHDAReg *reg, uint32
     if (!reg) {
         return;
     }
+    if (!reg->wmask) {
+        /* read-only register */
+        return;
+    }
 
     if (d->debug) {
         time_t now = time(NULL);
-- 
2.9.3