[PATCH 5.11 021/210] drm/radeon: Fix size overflow

Greg Kroah-Hartman
2021-04-12T09:31:03Z

From: xinhui pan <xinhui.pan@amd.com>

commit 2efc021060c2aa55e1e8f7b98249d3ea63232fc7 upstream.

ttm->num_pages is uint32. Hit overflow when << PAGE_SHIFT directly

Fixes: 230c079fdcf4 ("drm/ttm: make num_pages uint32_t")
Signed-off-by: xinhui pan <xinhui.pan@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/gpu/drm/radeon/radeon_ttm.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/radeon/radeon_ttm.c
+++ b/drivers/gpu/drm/radeon/radeon_ttm.c
@@ -365,7 +365,7 @@ static int radeon_ttm_tt_pin_userptr(str
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)
@@ -387,7 +387,7 @@ static int radeon_ttm_tt_pin_userptr(str
} 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;