Patch "drm/tegra: Avoid potential 32-bit integer overflow" has been added to the 5.15-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    drm/tegra: Avoid potential 32-bit integer overflow

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-tegra-avoid-potential-32-bit-integer-overflow.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 9afc13306524a41bf9c18e5c4d716be75baafa6a
Author: Nur Hussein <hussein@xxxxxxxxxxx>
Date:   Thu Apr 6 04:25:59 2023 +0800

    drm/tegra: Avoid potential 32-bit integer overflow
    
    [ 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@xxxxxxxxxxx>
    Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/gpu/drm/tegra/sor.c b/drivers/gpu/drm/tegra/sor.c
index 0ea320c1092bd..f2f76a0897a80 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;