[PATCH] drm/msm/gem: Add check for kmalloc

[Jiasheng Jiang]

Add the check for the return value of kmalloc in order to avoid
NULL pointer dereference in copy_from_user.

Fixes: 20224d715a88 ("drm/msm/submit: Move copy_from_user ahead of locking bos")
Signed-off-by: Jiasheng Jiang <jiash...@iscas.ac.cn>
---
 drivers/gpu/drm/msm/msm_gem_submit.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/msm/msm_gem_submit.c 
b/drivers/gpu/drm/msm/msm_gem_submit.c
index 45a3e5cadc7d..7c2cc1262c05 100644
--- a/drivers/gpu/drm/msm/msm_gem_submit.c
+++ b/drivers/gpu/drm/msm/msm_gem_submit.c
@@ -209,6 +209,10 @@ static int submit_lookup_cmds(struct msm_gem_submit 
*submit,
                        goto out;
                }
                submit->cmd[i].relocs = kmalloc(sz, GFP_KERNEL);
+               if (!submit->cmd[i].relocs) {
+                       ret = -ENOMEM;
+                       goto out;
+               }
                ret = copy_from_user(submit->cmd[i].relocs, userptr, sz);
                if (ret) {
                        ret = -EFAULT;
-- 
2.25.1