[PATCH] drm: zynqmp_dp: Fix integer overflow in zynqmp_dp_rate_get()

[Karol Przybylski]

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 at gmail.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