From: Colin Ian King <colin.king@xxxxxxxxxxxxx>
There is a potential integer overflow when multiplying various sized
integers that are cast to u32 integers using u32 multiplication and
then assigning the result to a u64. Fix this by casting MIPI_TX_BPP
to a u64 to force the multiplication to use u64 math and hence avoid
any potential overflows.
Addresses-Coverity: ("Unintentional integer overflow")
Fixes: 98521f4d4b4c ("drm/kmb: Mipi DSI part of the display driver")
Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
---
drivers/gpu/drm/kmb/kmb_dsi.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/kmb/kmb_dsi.c b/drivers/gpu/drm/kmb/kmb_dsi.c
index 4b5d82af84b3..6c3081356bd9 100644
--- a/drivers/gpu/drm/kmb/kmb_dsi.c
+++ b/drivers/gpu/drm/kmb/kmb_dsi.c
@@ -1369,7 +1369,7 @@ int kmb_dsi_mode_set(struct kmb_dsi *kmb_dsi, struct drm_display_mode *mode,
*/
data_rate = ((((u32)mode->crtc_vtotal * (u32)mode->crtc_htotal) *
(u32)(drm_mode_vrefresh(mode)) *
- MIPI_TX_BPP) / mipi_tx_init_cfg.active_lanes) / 1000000;
+ (u64)MIPI_TX_BPP) / mipi_tx_init_cfg.active_lanes) / 1000000;
dev_dbg(kmb_dsi->dev, "data_rate=%u active_lanes=%d\n",
(u32)data_rate, mipi_tx_init_cfg.active_lanes);
--
2.28.0
