[PATCH RESEND] drm: Fix potential null pointer dereference issues in drm_managed.c

[Haoxiang Li]

Add check for the return value of kstrdup_const() in drm_managed.c
to prevent potential null pointer dereference.

Fixes: c6603c740e0e ("drm: add managed resources tied to drm_device")
Cc: sta...@vger.kernel.org
Signed-off-by: Haoxiang Li <haoxiang_li2...@163.com>
---
 drivers/gpu/drm/drm_managed.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/drm_managed.c b/drivers/gpu/drm/drm_managed.c
index cc4c463daae7..368763d4c24e 100644
--- a/drivers/gpu/drm/drm_managed.c
+++ b/drivers/gpu/drm/drm_managed.c
@@ -151,6 +151,11 @@ int __drmm_add_action(struct drm_device *dev,
        }
 
        dr->node.name = kstrdup_const(name, GFP_KERNEL);
+       if (!dr->node.name) {
+               kfree(dr);
+               return -ENOMEM;
+       }
+
        if (data) {
                void_ptr = (void **)&dr->data;
                *void_ptr = data;
@@ -236,6 +241,10 @@ void *drmm_kmalloc(struct drm_device *dev, size_t size, 
gfp_t gfp)
                return NULL;
        }
        dr->node.name = kstrdup_const("kmalloc", gfp);
+       if (dr->node.name) {
+               kfree(dr);
+               return NULL;
+       }
 
        add_dr(dev, dr);
 
-- 
2.25.1