linux-kernel - [PATCH] drm/nouveau/core: fix the uninitialized use in nvkm_ioctl

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Date:   Wed, 16 Jun 2021 15:50:41 -0700
From:   Yizhuo Zhai <yzhai003@....edu>
To:     bskeggs@...hat.com, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, nouveau@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] drm/nouveau/core: fix the uninitialized use in nvkm_ioctl_map()

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@....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