linux-kernel - [PATCH-next] Fix unintentional integer overflow

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Message-Id: <20241003071431.328259-1-advaitdhamorikar@gmail.com>
Date: Thu,  3 Oct 2024 12:44:31 +0530
From: Advait Dhamorikar <advaitdhamorikar@...il.com>
To: alexander.deucher@....com,
	christian.koenig@....com,
	Xinhui.Pan@....com,
	airlied@...il.com,
	simona@...ll.ch,
	leo.liu@....com,
	sathishkumar.sundararaju@....com,
	saleemkhan.jamadar@....com,
	Veerabadhran.Gopalakrishnan@....com,
	advaitdhamorikar@...il.com,
	sonny.jiang@....com
Cc: amd-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	skhan@...uxfoundation.org,
	anupnewsmail@...il.com
Subject: [PATCH-next] Fix unintentional integer overflow

Fix overflow issue by casting uint8_t to uint64_t in JPEG
instance multiplication.
The expression's value may not be what the programmer intended,
because the expression is evaluated using
a narrow (i.e. few bits) integer type.

Fixes: f0b19b84d391 ("drm/amdgpu: add amdgpu_jpeg_sched_mask debugfs")
Signed-off-by: Advait Dhamorikar <advaitdhamorikar@...il.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_jpeg.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_jpeg.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_jpeg.c
index 95e2796919fc..b6f0435f56ba 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_jpeg.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_jpeg.c
@@ -357,7 +357,7 @@ static int amdgpu_debugfs_jpeg_sched_mask_set(void *data, u64 val)
 	if (!adev)
 		return -ENODEV;
 
-	mask = (1 << (adev->jpeg.num_jpeg_inst * adev->jpeg.num_jpeg_rings)) - 1;
+	mask = ((uint64_t)1 << (adev->jpeg.num_jpeg_inst * adev->jpeg.num_jpeg_rings)) - 1;
 	if ((val & mask) == 0)
 		return -EINVAL;
 
-- 
2.34.1