linux-kernel - [PATCH] drm/vc4: hdmi: Fixed possible integer overflow

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Message-ID: <PA4P189MB1421E63C0FF3EBF234A80AB38BA79@PA4P189MB1421.EURP189.PROD.OUTLOOK.COM>
Date:   Thu,  9 Jun 2022 23:50:31 +0500
From:   Saud Farooqui <farooqui_saud@...mail.com>
To:     emma@...olt.net, mripard@...nel.org, airlied@...ux.ie,
        daniel@...ll.ch, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Cc:     Saud Farooqui <farooqui_saud@...mail.com>
Subject: [PATCH] drm/vc4: hdmi: Fixed possible integer overflow

Multiplying ints and saving it in unsigned long long
could lead to integer overflow before being type casted to
unsigned long long.

Addresses-Coverity:  1505113: Unintentional integer overflow.

Signed-off-by: Saud Farooqui <farooqui_saud@...mail.com>
---
 drivers/gpu/drm/vc4/vc4_hdmi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index 823d812f4982..ce9d16666d91 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -1481,7 +1481,7 @@ vc4_hdmi_encoder_compute_mode_clock(const struct drm_display_mode *mode,
 				    unsigned int bpc,
 				    enum vc4_hdmi_output_format fmt)
 {
-	unsigned long long clock = mode->clock * 1000;
+	unsigned long long clock = mode->clock * 1000ULL;
 
 	if (mode->flags & DRM_MODE_FLAG_DBLCLK)
 		clock = clock * 2;
-- 
2.25.1