Re: [PATCH] drm/tegra: Fix bo reference leak in host1x_reloc_copy_from_user()

[kernel test robot <lkp@intel.com>]

Hi Wentao,

kernel test robot noticed the following build errors:

[auto build test ERROR on tegra/for-next]
[also build test ERROR on daeinki-drm-exynos/exynos-drm-next drm/drm-next drm-i915/for-linux-next drm-i915/for-linux-next-fixes drm-misc/drm-misc-next drm-tip/drm-tip linus/master v7.3-rc3 next-20260916]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Wentao-Liang/drm-tegra-Fix-bo-reference-leak-in-host1x_reloc_copy_from_user/20260916-182550
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tegra/linux.git for-next
patch link:    https://lore.kernel.org/r/20260916182550.2091797-1-vulab%40iscas.ac.cn
patch subject: [PATCH] drm/tegra: Fix bo reference leak in host1x_reloc_copy_from_user()
config: arc-randconfig-1001-20260917 (https://download.01.org/0day-ci/archive/20260917/202609171531.CIG2e49k-lkp@intel.com/config)
compiler: arc-linux-gcc (GCC) 15.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260917/202609171531.CIG2e49k-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202609171531.CIG2e49k-lkp@intel.com/

All errors (new ones prefixed by >>):

   drivers/gpu/drm/tegra/drm.c: In function 'host1x_reloc_copy_from_user':
>> drivers/gpu/drm/tegra/drm.c:163:48: error: passing argument 1 of 'drm_gem_object_put' from incompatible pointer type [-Wincompatible-pointer-types]
     163 |                 drm_gem_object_put(dest->cmdbuf.bo);
         |                                    ~~~~~~~~~~~~^~~
         |                                                |
         |                                                struct host1x_bo *
   In file included from include/drm/drm_gpuvm.h:35,
                    from include/drm/drm_debugfs.h:38,
                    from drivers/gpu/drm/tegra/drm.c:19:
   include/drm/drm_gem.h:572:43: note: expected 'struct drm_gem_object *' but argument is of type 'struct host1x_bo *'
     572 | drm_gem_object_put(struct drm_gem_object *obj)
         |                    ~~~~~~~~~~~~~~~~~~~~~~~^~~


vim +/drm_gem_object_put +163 drivers/gpu/drm/tegra/drm.c

   126	
   127	static int host1x_reloc_copy_from_user(struct host1x_reloc *dest,
   128					       struct drm_tegra_reloc __user *src,
   129					       struct drm_device *drm,
   130					       struct drm_file *file)
   131	{
   132		u32 cmdbuf, target;
   133		int err;
   134	
   135		err = get_user(cmdbuf, &src->cmdbuf.handle);
   136		if (err < 0)
   137			return err;
   138	
   139		err = get_user(dest->cmdbuf.offset, &src->cmdbuf.offset);
   140		if (err < 0)
   141			return err;
   142	
   143		err = get_user(target, &src->target.handle);
   144		if (err < 0)
   145			return err;
   146	
   147		err = get_user(dest->target.offset, &src->target.offset);
   148		if (err < 0)
   149			return err;
   150	
   151		err = get_user(dest->shift, &src->shift);
   152		if (err < 0)
   153			return err;
   154	
   155		dest->flags = HOST1X_RELOC_READ | HOST1X_RELOC_WRITE;
   156	
   157		dest->cmdbuf.bo = tegra_gem_lookup(file, cmdbuf);
   158		if (!dest->cmdbuf.bo)
   159			return -ENOENT;
   160	
   161		dest->target.bo = tegra_gem_lookup(file, target);
   162		if (!dest->target.bo) {
 > 163			drm_gem_object_put(dest->cmdbuf.bo);
   164			return -ENOENT;
   165		}
   166	
   167		return 0;
   168	}
   169	

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