From: Young Xiao <YangX92@hotmail.com>
Date: Tue, 27 Nov 2018 11:50:17 +0000 (+0000)
Subject: drm: radeon: fix overflow on 32bit systems
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=b3f4bdda998be6018b76f46b852313ae74db5606;p=openwrt%2Fstaging%2Fblogic.git

drm: radeon: fix overflow on 32bit systems

the type mem->start is unsigned long, so this can overflow on
32bit system, since the type addr is uint64_t.

Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Young Xiao <YangX92@hotmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---

diff --git a/drivers/gpu/drm/radeon/radeon_vm.c b/drivers/gpu/drm/radeon/radeon_vm.c
index fed11ece0de6..a3d2ca07a058 100644
--- a/drivers/gpu/drm/radeon/radeon_vm.c
+++ b/drivers/gpu/drm/radeon/radeon_vm.c
@@ -946,7 +946,7 @@ int radeon_vm_bo_update(struct radeon_device *rdev,
 		bo_va->flags &= ~RADEON_VM_PAGE_WRITEABLE;
 
 	if (mem) {
-		addr = mem->start << PAGE_SHIFT;
+		addr = (u64)mem->start << PAGE_SHIFT;
 		if (mem->mem_type != TTM_PL_SYSTEM) {
 			bo_va->flags |= RADEON_VM_PAGE_VALID;
 		}