Hi Rohan, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on linus/master] [cannot apply to v5.4-rc2 next-20191011] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Rohan-Garg/drm-ioctl-Add-a-ioctl... If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp(a)intel.com&gt; Reported-by: Dan Carpenter <dan.carpenter(a)oracle.com&gt; smatch warnings: drivers/gpu/drm/drm_gem.c:967 drm_dumb_set_label_ioctl() error: 'label' dereferencing possible ERR_PTR() # https://github.com/0day-ci/linux/commit/0f0cd7ef9f3b1623ab982f12dc748998f... git remote add linux-review https://github.com/0day-ci/linux git remote update linux-review git checkout 0f0cd7ef9f3b1623ab982f12dc748998f31e10b4 vim +/label +967 drivers/gpu/drm/drm_gem.c 673a394b1e3b69 Eric Anholt 2008-07-30 943 0f0cd7ef9f3b16 Rohan Garg 2019-10-11 944 int drm_dumb_set_label_ioctl(struct drm_device *dev, 0f0cd7ef9f3b16 Rohan Garg 2019-10-11 945 void *data, struct drm_file *file_priv) 0f0cd7ef9f3b16 Rohan Garg 2019-10-11 946 { 0f0cd7ef9f3b16 Rohan Garg 2019-10-11 947 char *label; 0f0cd7ef9f3b16 Rohan Garg 2019-10-11 948 struct drm_dumb_set_label_object *args = data; 0f0cd7ef9f3b16 Rohan Garg 2019-10-11 949 int ret = 0; 0f0cd7ef9f3b16 Rohan Garg 2019-10-11 950 0f0cd7ef9f3b16 Rohan Garg 2019-10-11 951 if (!args->len || !args->name) 0f0cd7ef9f3b16 Rohan Garg 2019-10-11 952 return -EINVAL; 0f0cd7ef9f3b16 Rohan Garg 2019-10-11 953 0f0cd7ef9f3b16 Rohan Garg 2019-10-11 954 if (!dev->driver->label) 0f0cd7ef9f3b16 Rohan Garg 2019-10-11 955 return -EOPNOTSUPP; 0f0cd7ef9f3b16 Rohan Garg 2019-10-11 956 0f0cd7ef9f3b16 Rohan Garg 2019-10-11 957 label = strndup_user(u64_to_user_ptr(args->name), args->len); 0f0cd7ef9f3b16 Rohan Garg 2019-10-11 958 0f0cd7ef9f3b16 Rohan Garg 2019-10-11 959 if (IS_ERR(label)) { 0f0cd7ef9f3b16 Rohan Garg 2019-10-11 960 ret = PTR_ERR(label); 0f0cd7ef9f3b16 Rohan Garg 2019-10-11 961 goto err; ^^^^^^^^ Just return PTR_ERR(label); 0f0cd7ef9f3b16 Rohan Garg 2019-10-11 962 } 0f0cd7ef9f3b16 Rohan Garg 2019-10-11 963 0f0cd7ef9f3b16 Rohan Garg 2019-10-11 964 ret = dev->driver->label(dev, file_priv, args->handle, label); 0f0cd7ef9f3b16 Rohan Garg 2019-10-11 965 0f0cd7ef9f3b16 Rohan Garg 2019-10-11 966 err: 0f0cd7ef9f3b16 Rohan Garg 2019-10-11 @967 kfree(label); ^^^^^^^^^^^^ This will Oops. 0f0cd7ef9f3b16 Rohan Garg 2019-10-11 968 return ret; 0f0cd7ef9f3b16 Rohan Garg 2019-10-11 969 } 0f0cd7ef9f3b16 Rohan Garg 2019-10-11 970 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation