[PATCH] drm/nouveau/core: fix the uninitialized use in nvkm_ioctl_map()

[Yizhuo Zhai]

In function nvkm_ioctl_map(), the variable "type" could be
uninitialized if "nvkm_object_map()" returns error code,
however, it does not check the return value and directly
use the "type" in the if statement, which is potentially
unsafe.

Signed-off-by: Yizhuo <yzhai003 at ucr.edu>
---
 drivers/gpu/drm/nouveau/nvkm/core/ioctl.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/nouveau/nvkm/core/ioctl.c
b/drivers/gpu/drm/nouveau/nvkm/core/ioctl.c
index d777df5a64e6..7f2e8482f167 100644
--- a/drivers/gpu/drm/nouveau/nvkm/core/ioctl.c
+++ b/drivers/gpu/drm/nouveau/nvkm/core/ioctl.c
@@ -266,6 +266,8 @@ nvkm_ioctl_map(struct nvkm_client *client,
                ret = nvkm_object_map(object, data, size, &type,
                                      &args->v0.handle,
                                      &args->v0.length);
+               if (ret)
+                       return ret;
                if (type == NVKM_OBJECT_MAP_IO)
                        args->v0.type = NVIF_IOCTL_MAP_V0_IO;
                else
-- 
2.17.1