diff mbox series

[v3,7/9] sm501: Do not allow guest to set invalid format

Message ID 26d4fa9b8ce81e2723e98d592ccba7550042752c.1592686588.git.balaton@eik.bme.hu
State New
Headers show
Series More sm501 fixes and optimisations | expand

Commit Message

BALATON Zoltan June 20, 2020, 8:56 p.m. UTC 
Prevent guest setting invalid format value that might trip checks in
sm501_2d_operation().

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
---
 hw/display/sm501.c | 3 +++
 1 file changed, 3 insertions(+)
diff mbox series

Patch

diff --git a/hw/display/sm501.c b/hw/display/sm501.c
index 6349f31e64..7e4c042d52 100644
--- a/hw/display/sm501.c
+++ b/hw/display/sm501.c
@@ -1503,6 +1503,9 @@  static void sm501_2d_engine_write(void *opaque, hwaddr addr,
         s->twoD_background = value;
         break;
     case SM501_2D_STRETCH:
+        if (((value >> 20) & 3) == 3) {
+            value &= ~BIT(20);
+        }
         s->twoD_stretch = value;
         break;
     case SM501_2D_COLOR_COMPARE: