ttm->num_pages is uint32. Hit overflow when << PAGE_SHIFT directly
Signed-off-by: xinhui pan <xinhui.pan@xxxxxxx>
---
drivers/gpu/drm/radeon/radeon_ttm.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c
index 2a61cff325e4..b3fb84b45923 100644
--- a/drivers/gpu/drm/radeon/radeon_ttm.c
+++ b/drivers/gpu/drm/radeon/radeon_ttm.c
@@ -360,7 +360,7 @@ static int radeon_ttm_tt_pin_userptr(struct ttm_device *bdev, struct ttm_tt *ttm
if (gtt->userflags & RADEON_GEM_USERPTR_ANONONLY) {
/* check that we only pin down anonymous memory
to prevent problems with writeback */
- unsigned long end = gtt->userptr + ttm->num_pages * PAGE_SIZE;
+ unsigned long end = gtt->userptr + (u64)ttm->num_pages * PAGE_SIZE;
struct vm_area_struct *vma;
vma = find_vma(gtt->usermm, gtt->userptr);
if (!vma || vma->vm_file || vma->vm_end < end)
@@ -382,7 +382,7 @@ static int radeon_ttm_tt_pin_userptr(struct ttm_device *bdev, struct ttm_tt *ttm
} while (pinned < ttm->num_pages);
r = sg_alloc_table_from_pages(ttm->sg, ttm->pages, ttm->num_pages, 0,
- ttm->num_pages << PAGE_SHIFT,
+ (u64)ttm->num_pages << PAGE_SHIFT,
GFP_KERNEL);
if (r)
goto release_sg;
--
2.25.1
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