linux-kernel - [PATCH] drm: zynqmp_dp: Fix integer overflow in zynqmp_dp_rate

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Message-Id: <20241211122026.797511-1-karprzy7@gmail.com>
Date: Wed, 11 Dec 2024 13:20:26 +0100
From: Karol Przybylski <karprzy7@...il.com>
To: karprzy7@...il.com,
	laurent.pinchart@...asonboard.com,
	tomi.valkeinen@...asonboard.com,
	maarten.lankhorst@...ux.intel.com,
	mripard@...nel.org,
	tzimmermann@...e.de,
	airlied@...il.com,
	simona@...ll.ch,
	michal.simek@....com
Cc: dri-devel@...ts.freedesktop.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] drm: zynqmp_dp: Fix integer overflow in zynqmp_dp_rate_get()

This patch fixes a potential integer overflow in the zynqmp_dp_rate_get() function.

The issue comes up when the expression drm_dp_bw_code_to_link_rate(dp->test.bw_code) * 10000 is evaluated using 32-bit arithmetic.

Now the constant is casted to compatible u64 type.

Resolves CID 1636340 and CID 1635811

Signed-off-by: Karol Przybylski <karprzy7@...il.com>
---
 drivers/gpu/drm/xlnx/zynqmp_dp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/xlnx/zynqmp_dp.c b/drivers/gpu/drm/xlnx/zynqmp_dp.c
index 25c5dc61e..55e92344b 100644
--- a/drivers/gpu/drm/xlnx/zynqmp_dp.c
+++ b/drivers/gpu/drm/xlnx/zynqmp_dp.c
@@ -2190,7 +2190,7 @@ static int zynqmp_dp_rate_get(void *data, u64 *val)
 	struct zynqmp_dp *dp = data;
 
 	mutex_lock(&dp->lock);
-	*val = drm_dp_bw_code_to_link_rate(dp->test.bw_code) * 10000;
+	*val = drm_dp_bw_code_to_link_rate(dp->test.bw_code) * (u64)10000;
 	mutex_unlock(&dp->lock);
 	return 0;
 }
-- 
2.34.1