On 8/17/26 16:07, Taimuraz Kaitmazov wrote:

amdxdna_drm_sync_bo_ioctl() forms the range for a device BO by adding the caller's offset and size to the BO address without checking either, while amdxdna_flush_bo() one call down guards the same arithmetic with check_add_overflow().

A size that wraps flush_end leaves it below the heap it is clamped against, so every heap fails the start >= end test, and a sync that asked for more than the address space holds reports success having flushed nothing. Reject it instead.

Signed-off-by: Taimuraz Kaitmazov taimuraz@kaitmazov.com

drivers/accel/amdxdna/amdxdna_gem.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/accel/amdxdna/amdxdna_gem.c b/drivers/accel/amdxdna/amdxdna_gem.c index f88b5349cd4b..77a9493cd7ba 100644 --- a/drivers/accel/amdxdna/amdxdna_gem.c +++ b/drivers/accel/amdxdna/amdxdna_gem.c @@ -1274,8 +1274,13 @@ int amdxdna_drm_sync_bo_ioctl(struct drm_device *dev, struct amdxdna_gem_obj *heap; unsigned long heap_id; u64 bo_start = amdxdna_gem_dev_addr(abo);

• u64 flush_start = bo_start + args->offset;
  

• u64 flush_end = flush_start + args->size;
  

• u64 flush_start, flush_end;
  

• if (check_add_overflow(bo_start, args->offset, &flush_start) ||
  

•     check_add_overflow(flush_start, args->size, &flush_end)) {
  

• 	ret = -EINVAL;
  

• 	goto put_obj;
  

• }
  

Reviewed-by: Lizhi Hou lizhi.hou@amd.com

xa_for_each_range(&client->dev_heap_xa, heap_id, heap, abo->heap_start_id, abo->heap_end_id) {