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References: <20221219234638.3661-4-mike.leach@linaro.org> <202212240621.sgsPYIdK-lkp@intel.com>
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From:   Mike Leach <mike.leach@linaro.org>
Date:   Mon, 16 Jan 2023 12:32:09 +0000
Message-ID: <CAJ9a7ViJZre-X563M6tc+_rbi_LRc11z5THRSw3iK6Fxd4SwYw@mail.gmail.com>
Subject: Re: [PATCH v5 3/6] coresight: configfs: Add in binary attributes to
 load files
To:     Dan Carpenter <error27@gmail.com>
Cc:     oe-kbuild@lists.linux.dev, linux-arm-kernel@lists.infradead.org,
        coresight@lists.linaro.org, linux-kernel@vger.kernel.org,
        lkp@intel.com, oe-kbuild-all@lists.linux.dev,
        mathieu.poirier@linaro.org, suzuki.poulose@arm.com,
        acme@kernel.org, james.clark@arm.com
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Precedence: bulk

Hi,

Thanks for this - I'll fix in next set

Mike

On Sat, 24 Dec 2022 at 07:16, Dan Carpenter <error27@gmail.com> wrote:
>
> Hi Mike,
>
> https://git-scm.com/docs/git-format-patch#_base_tree_information]
>
> url:    https://github.com/intel-lab-lkp/linux/commits/Mike-Leach/coresight-syscfg-Extend-configfs-for-config-load/20221220-074850
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/soc/soc.git for-next
> patch link:    https://lore.kernel.org/r/20221219234638.3661-4-mike.leach%40linaro.org
> patch subject: [PATCH v5 3/6] coresight: configfs: Add in binary attributes to load files
> config: arm-randconfig-m041-20221218
> compiler: arm-linux-gnueabi-gcc (GCC) 12.1.0
>
> If you fix the issue, kindly add following tag where applicable
> | Reported-by: kernel test robot <lkp@intel.com>
> | Reported-by: Dan Carpenter <error27@gmail.com>
>
> smatch warnings:
> drivers/hwtracing/coresight/coresight-syscfg-configfs.c:595 cscfg_cfg_load_write() warn: possible memory leak of 'load_descs'
>
> vim +/load_descs +595 drivers/hwtracing/coresight/coresight-syscfg-configfs.c
>
> 97b8fd654556b1 Mike Leach 2022-12-19  543  static ssize_t cscfg_cfg_load_write(struct config_item *item, const void *buffer, size_t size)
> 97b8fd654556b1 Mike Leach 2022-12-19  544  {
> 97b8fd654556b1 Mike Leach 2022-12-19  545       struct cscfg_fs_load_descs *load_descs = 0;
> 97b8fd654556b1 Mike Leach 2022-12-19  546       struct cscfg_load_owner_info *owner_info = 0;
> 97b8fd654556b1 Mike Leach 2022-12-19  547       int err = 0;
> 97b8fd654556b1 Mike Leach 2022-12-19  548
> 97b8fd654556b1 Mike Leach 2022-12-19  549       /* ensure we cannot simultaneously load and unload */
> 97b8fd654556b1 Mike Leach 2022-12-19  550       if (!mutex_trylock(&cfs_mutex))
> 97b8fd654556b1 Mike Leach 2022-12-19  551               return -EBUSY;
> 97b8fd654556b1 Mike Leach 2022-12-19  552
> 97b8fd654556b1 Mike Leach 2022-12-19  553       /* check configfs load / unload ops are permitted */
> 97b8fd654556b1 Mike Leach 2022-12-19  554       if (!cscfg_fs_load_enabled || unload_owner_info) {
> 97b8fd654556b1 Mike Leach 2022-12-19  555               err = -EBUSY;
> 97b8fd654556b1 Mike Leach 2022-12-19  556               goto exit_unlock;
> 97b8fd654556b1 Mike Leach 2022-12-19  557       }
> 97b8fd654556b1 Mike Leach 2022-12-19  558
> 97b8fd654556b1 Mike Leach 2022-12-19  559       if (size > CSCFG_FILE_MAXSIZE) {
> 97b8fd654556b1 Mike Leach 2022-12-19  560               pr_err("cscfg: Load error - Input file too large.\n");
> 97b8fd654556b1 Mike Leach 2022-12-19  561               err = -EINVAL;
> 97b8fd654556b1 Mike Leach 2022-12-19  562               goto exit_unlock;
> 97b8fd654556b1 Mike Leach 2022-12-19  563       }
> 97b8fd654556b1 Mike Leach 2022-12-19  564
> 97b8fd654556b1 Mike Leach 2022-12-19  565       load_descs = kzalloc(sizeof(struct cscfg_fs_load_descs), GFP_KERNEL);
> 97b8fd654556b1 Mike Leach 2022-12-19  566       owner_info = kzalloc(sizeof(struct cscfg_load_owner_info), GFP_KERNEL);
> 97b8fd654556b1 Mike Leach 2022-12-19  567       if (!load_descs || !owner_info) {
> 97b8fd654556b1 Mike Leach 2022-12-19  568               err = -ENOMEM;
> 97b8fd654556b1 Mike Leach 2022-12-19  569               goto exit_memfree;
>
> This exit leaks (will never happen in real life though).
>
> 97b8fd654556b1 Mike Leach 2022-12-19  570       }
> 97b8fd654556b1 Mike Leach 2022-12-19  571
> 97b8fd654556b1 Mike Leach 2022-12-19  572       owner_info->owner_handle = load_descs;
> 97b8fd654556b1 Mike Leach 2022-12-19  573       owner_info->type = CSCFG_OWNER_CONFIGFS;
> 97b8fd654556b1 Mike Leach 2022-12-19  574
> 97b8fd654556b1 Mike Leach 2022-12-19  575       err = cscfg_file_read_buffer(buffer, size, load_descs);
> 97b8fd654556b1 Mike Leach 2022-12-19  576       if (err) {
> 97b8fd654556b1 Mike Leach 2022-12-19  577               pr_err("cscfg: Load error - Failed to read input file.\n");
> 97b8fd654556b1 Mike Leach 2022-12-19  578               goto exit_memfree;
> 97b8fd654556b1 Mike Leach 2022-12-19  579       }
> 97b8fd654556b1 Mike Leach 2022-12-19  580
> 97b8fd654556b1 Mike Leach 2022-12-19  581       err = cscfg_load_config_sets(load_descs->config_descs, load_descs->feat_descs, owner_info);
> 97b8fd654556b1 Mike Leach 2022-12-19  582       if (err) {
> 97b8fd654556b1 Mike Leach 2022-12-19  583               pr_err("cscfg: Load error - Failed to load configuaration file.\n");
> 97b8fd654556b1 Mike Leach 2022-12-19  584               goto exit_memfree;
> 97b8fd654556b1 Mike Leach 2022-12-19  585       }
> 97b8fd654556b1 Mike Leach 2022-12-19  586
> 97b8fd654556b1 Mike Leach 2022-12-19  587       mutex_unlock(&cfs_mutex);
> 97b8fd654556b1 Mike Leach 2022-12-19  588       return size;
> 97b8fd654556b1 Mike Leach 2022-12-19  589
> 97b8fd654556b1 Mike Leach 2022-12-19  590  exit_memfree:
> 97b8fd654556b1 Mike Leach 2022-12-19  591       cscfg_configfs_free_owner_info(owner_info);
> 97b8fd654556b1 Mike Leach 2022-12-19  592
> 97b8fd654556b1 Mike Leach 2022-12-19  593  exit_unlock:
> 97b8fd654556b1 Mike Leach 2022-12-19  594       mutex_unlock(&cfs_mutex);
> 97b8fd654556b1 Mike Leach 2022-12-19 @595       return err;
> 97b8fd654556b1 Mike Leach 2022-12-19  596  }
>
> --
> 0-DAY CI Kernel Test Service
> https://01.org/lkp
>


-- 
Mike Leach
Principal Engineer, ARM Ltd.
Manchester Design Centre. UK