[PATCH] drm/bochs: avoided potential integer overflow

[Maxim Korotkov]

if the bochs_dispi_read() function returns a value between
0x8000 and 0xFFFF, then an overflow may occurs.

Found by Security Code and Linux Verification Center (linuxtesting.org)

Signed-off-by: Maxim Korotkov <m.korotkov at securitycode.ru>
---
 drivers/gpu/drm/tiny/bochs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/tiny/bochs.c b/drivers/gpu/drm/tiny/bochs.c
index c23c9f0cf49c..ad31049f9779 100644
--- a/drivers/gpu/drm/tiny/bochs.c
+++ b/drivers/gpu/drm/tiny/bochs.c
@@ -240,7 +240,7 @@ static int bochs_hw_init(struct drm_device *dev)
 
 	id = bochs_dispi_read(bochs, VBE_DISPI_INDEX_ID);
 	mem = bochs_dispi_read(bochs, VBE_DISPI_INDEX_VIDEO_MEMORY_64K)
-		* 64 * 1024;
+		* mul_u32_u32(64, 1024);
 	if ((id & 0xfff0) != VBE_DISPI_ID0) {
 		DRM_ERROR("ID mismatch\n");
 		return -ENODEV;
-- 
2.34.1