linux-kernel - [PATCH] drm/amdgpu: Fix integer overflow in amdgpu_gem_add_input

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Message-ID: <aDCd0MrLste5b2HM@stanley.mountain>
Date: Fri, 23 May 2025 19:09:52 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Arvind Yadav <arvind.yadav@....com>
Cc: Alex Deucher <alexander.deucher@....com>,
	Christian König <christian.koenig@....com>,
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
	Arvind Yadav <Arvind.Yadav@....com>,
	Shashank Sharma <shashank.sharma@....com>,
	Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam@....com>,
	Yunxiang Li <Yunxiang.Li@....com>, Frank Min <Frank.Min@....com>,
	Kent Russell <kent.russell@....com>, amd-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [PATCH] drm/amdgpu: Fix integer overflow in
 amdgpu_gem_add_input_fence()

The "num_syncobj_handles" is a u32 value that comes from the user via the
ioctl.  On 32bit systems the "sizeof(uint32_t) * num_syncobj_handles"
multiplication can have an integer overflow.  Use size_mul() to fix that.

Fixes: 38c67ec9aa4b ("drm/amdgpu: Add input fence to sync bo map/unmap")
Cc: stable@...r.kernel.org
Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
index 2c68118fe9fd..0ecc88df7208 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
@@ -58,7 +58,7 @@ amdgpu_gem_add_input_fence(struct drm_file *filp,
 		return 0;
 
 	syncobj_handles = memdup_user(u64_to_user_ptr(syncobj_handles_array),
-				      sizeof(uint32_t) * num_syncobj_handles);
+				      size_mul(sizeof(uint32_t), num_syncobj_handles));
 	if (IS_ERR(syncobj_handles))
 		return PTR_ERR(syncobj_handles);
 
-- 
2.47.2