diff options
| -rw-r--r-- | drivers/gpu/drm/drm_crtc.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c index 35ea15d5ffff..b1c2b278005c 100644 --- a/drivers/gpu/drm/drm_crtc.c +++ b/drivers/gpu/drm/drm_crtc.c @@ -3784,9 +3784,26 @@ int drm_mode_create_dumb_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv) { struct drm_mode_create_dumb *args = data; + u32 cpp, stride, size; if (!dev->driver->dumb_create) return -ENOSYS; + if (!args->width || !args->height || !args->bpp) + return -EINVAL; + + /* overflow checks for 32bit size calculations */ + cpp = DIV_ROUND_UP(args->bpp, 8); + if (cpp > 0xffffffffU / args->width) + return -EINVAL; + stride = cpp * args->width; + if (args->height > 0xffffffffU / stride) + return -EINVAL; + + /* test for wrap-around */ + size = args->height * stride; + if (PAGE_ALIGN(size) == 0) + return -EINVAL; + return dev->driver->dumb_create(file_priv, dev, args); } |