From: Dan Carpenter Date: Fri, 10 Aug 2018 10:50:32 +0000 (+0800) Subject: drm/amdgpu: fix integer overflow test in amdgpu_bo_list_create() X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=ff30e9e8509cb877dc7cbc776b36c70f5bdd290f;p=openwrt%2Fstaging%2Fblogic.git drm/amdgpu: fix integer overflow test in amdgpu_bo_list_create() We accidentally left out the size of the amdgpu_bo_list struct. It could lead to memory corruption on 32 bit systems. You'd have to pick the absolute maximum and set "num_entries == 59652323" then size would wrap to 16 bytes. Fixes: 920990cb080a ("drm/amdgpu: allocate the bo_list array after the list") Signed-off-by: Dan Carpenter Reviewed-by: Huang Rui Reviewed-by: Bas Nieuwenhuizen Signed-off-by: Huang Rui Signed-off-by: Alex Deucher --- diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c index d472a2c8399f..b80243d3972e 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c @@ -67,7 +67,8 @@ int amdgpu_bo_list_create(struct amdgpu_device *adev, struct drm_file *filp, unsigned i; int r; - if (num_entries > SIZE_MAX / sizeof(struct amdgpu_bo_list_entry)) + if (num_entries > (SIZE_MAX - sizeof(struct amdgpu_bo_list)) + / sizeof(struct amdgpu_bo_list_entry)) return -EINVAL; size = sizeof(struct amdgpu_bo_list);