linux-kernel - [PATCH AUTOSEL 4.19 6/9] drm/tegra: Avoid potential 32-bit integer overflow

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Message-Id: <20230501030633.3255202-6-sashal@kernel.org>
Date:   Sun, 30 Apr 2023 23:06:28 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Nur Hussein <hussein@...xcat.org>,
        Thierry Reding <treding@...dia.com>,
        Sasha Levin <sashal@...nel.org>, 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
Subject: [PATCH AUTOSEL 4.19 6/9] drm/tegra: Avoid potential 32-bit integer overflow

From: Nur Hussein <hussein@...xcat.org>

[ Upstream commit 2429b3c529da29d4277d519bd66d034842dcd70c ]

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>
Signed-off-by: Thierry Reding <treding@...dia.com>
Signed-off-by: Sasha Levin <sashal@...nel.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 83108e2430501..adc191ec26a99 100644
--- a/drivers/gpu/drm/tegra/sor.c
+++ b/drivers/gpu/drm/tegra/sor.c
@@ -829,7 +829,7 @@ 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;
-- 
2.39.2