qxl_bo_kmap_atomic_page() can fail. I think the user controls ->dst_offset so this can be used to corrupt memory.

Signed-off-by: Dan Carpenter dan.carpenter@oracle.com

diff --git a/drivers/gpu/drm/qxl/qxl_ioctl.c b/drivers/gpu/drm/qxl/qxl_ioctl.c index eda6f30..b2db482 100644 --- a/drivers/gpu/drm/qxl/qxl_ioctl.c +++ b/drivers/gpu/drm/qxl/qxl_ioctl.c @@ -86,6 +86,8 @@ apply_reloc(struct qxl_device *qdev, struct qxl_reloc_info *info) { void *reloc_page; reloc_page = qxl_bo_kmap_atomic_page(qdev, info->dst_bo, info->dst_offset & PAGE_MASK); + if (!reloc_page) + return; *(uint64_t *)(reloc_page + (info->dst_offset & ~PAGE_MASK)) = qxl_bo_physical_address(qdev, info->src_bo, info->src_offset);