qxl: fix qxl_release_{map,unmap}

s/PAGE_SIZE/PAGE_MASK/

Luckily release_offset is never larger than PAGE_SIZE, so the bug has no
bad side effects and managed to stay unnoticed for years that way ...

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20180418054257.15388-2-kraxel@redhat.com
Signed-off-by: Sean Paul <seanpaul@chromium.org>

diff --git a/drivers/gpu/drm/qxl/qxl_ioctl.c b/drivers/gpu/drm/qxl/qxl_ioctl.c
index e238a1a..6cc9f33 100644 (file)
--- a/drivers/gpu/drm/qxl/qxl_ioctl.c
+++ b/drivers/gpu/drm/qxl/qxl_ioctl.c
@@ -182,9 +182,9 @@ static int qxl_process_single_command(struct qxl_device *qdev,
                goto out_free_reloc;
 
        /* TODO copy slow path code from i915 */
-       fb_cmd = qxl_bo_kmap_atomic_page(qdev, cmd_bo, (release->release_offset & PAGE_SIZE));
+       fb_cmd = qxl_bo_kmap_atomic_page(qdev, cmd_bo, (release->release_offset & PAGE_MASK));
        unwritten = __copy_from_user_inatomic_nocache
-               (fb_cmd + sizeof(union qxl_release_info) + (release->release_offset & ~PAGE_SIZE),
+               (fb_cmd + sizeof(union qxl_release_info) + (release->release_offset & ~PAGE_MASK),
                 u64_to_user_ptr(cmd->command), cmd->command_size);
 
        {

diff --git a/drivers/gpu/drm/qxl/qxl_release.c b/drivers/gpu/drm/qxl/qxl_release.c
index 5d84a66..a0b4244 100644 (file)
--- a/drivers/gpu/drm/qxl/qxl_release.c
+++ b/drivers/gpu/drm/qxl/qxl_release.c
@@ -411,10 +411,10 @@ union qxl_release_info *qxl_release_map(struct qxl_device *qdev,
        struct qxl_bo_list *entry = list_first_entry(&release->bos, struct qxl_bo_list, tv.head);
        struct qxl_bo *bo = to_qxl_bo(entry->tv.bo);
 
-       ptr = qxl_bo_kmap_atomic_page(qdev, bo, release->release_offset & PAGE_SIZE);
+       ptr = qxl_bo_kmap_atomic_page(qdev, bo, release->release_offset & PAGE_MASK);
        if (!ptr)
                return NULL;
-       info = ptr + (release->release_offset & ~PAGE_SIZE);
+       info = ptr + (release->release_offset & ~PAGE_MASK);
        return info;
 }
 
@@ -426,7 +426,7 @@ void qxl_release_unmap(struct qxl_device *qdev,
        struct qxl_bo *bo = to_qxl_bo(entry->tv.bo);
        void *ptr;
 
-       ptr = ((void *)info) - (release->release_offset & ~PAGE_SIZE);
+       ptr = ((void *)info) - (release->release_offset & ~PAGE_MASK);
        qxl_bo_kunmap_atomic_page(qdev, bo, ptr);
 }