linux-kernel - [PATCH] drm/tegra : Avoid potential integer overflow of 32 bit int

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Message-Id: <20230405202559.2232430-1-hussein@unixcat.org>
Date:   Thu,  6 Apr 2023 04:25:59 +0800
From:   Nur Hussein <hussein@...xcat.org>
To:     thierry.reding@...il.com, mperttunen@...dia.com, airlied@...il.com,
        daniel@...ll.ch, jonathanh@...dia.com,
        dri-devel@...ts.freedesktop.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Nur Hussein <hussein@...xcat.org>
Subject: [PATCH] drm/tegra : Avoid potential integer overflow of 32 bit int

In tegra_sor_compute_config(), the 32-bit value mode->clock
is multiplied by 1000, and assigned to the u64 variable pclk.
We can avoid a potential 32-bit integer overflow by casting
mode->clock to u64 before we do the arithmetic and assignment.

Signed-off-by: Nur Hussein <hussein@...xcat.org>
---
 drivers/gpu/drm/tegra/sor.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/tegra/sor.c b/drivers/gpu/drm/tegra/sor.c
index cd25f409979c..8d910695775c 100644
--- a/drivers/gpu/drm/tegra/sor.c
+++ b/drivers/gpu/drm/tegra/sor.c
@@ -1153,7 +1153,7 @@ static int tegra_sor_compute_config(struct tegra_sor *sor,
 				    struct drm_dp_link *link)
 {
 	const u64 f = 100000, link_rate = link->rate * 1000;
-	const u64 pclk = mode->clock * 1000;
+	const u64 pclk = (u64)mode->clock * 1000;
 	u64 input, output, watermark, num;
 	struct tegra_sor_params params;
 	u32 num_syms_per_line;
-- 
2.34.1