[PATCH AUTOSEL 4.14 4/6] drm/tegra: Avoid potential 32-bit integer overflow

[Sasha Levin]

From: Nur Hussein <hussein at unixcat.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 at unixcat.org>
Signed-off-by: Thierry Reding <treding at nvidia.com>
Signed-off-by: Sasha Levin <sashal at kernel.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 352ae52be3418..76451c8bfb46b 100644
--- a/drivers/gpu/drm/tegra/sor.c
+++ b/drivers/gpu/drm/tegra/sor.c
@@ -709,7 +709,7 @@ 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