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From: kernel test robot <lkp@intel.com>
Subject: drivers/fpga/intel-m10-bmc-sec-update.c:103 flash_count_show() warn: possible memory leak of 'flash_buf'
Date: Tue, 06 Sep 2022 07:37:26 +0800
Message-ID: <202209060707.0aHHXixA-lkp@intel.com>
List-Id: <oe-kbuild.lists.linux.dev>
To: kbuild@lists.01.org

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BCC: lkp(a)intel.com
CC: kbuild-all(a)lists.01.org
CC: linux-kernel(a)vger.kernel.org
TO: Russ Weight <russell.h.weight@intel.com>
CC: Xu Yilun <yilun.xu@intel.com>
CC: Tom Rix <trix@redhat.com>

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git =
master
head:   7e18e42e4b280c85b76967a9106a13ca61c16179
commit: 154afa5c31cd2de5e6c2c4f35eee390993ee345a fpga: m10bmc-sec: expose m=
ax10 flash update count
date:   3 months ago
:::::: branch date: 27 hours ago
:::::: commit date: 3 months ago
config: x86_64-randconfig-m031-20220905 (https://download.01.org/0day-ci/ar=
chive/20220906/202209060707.0aHHXixA-lkp(a)intel.com/config)
compiler: gcc-11 (Debian 11.3.0-5) 11.3.0

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>

smatch warnings:
drivers/fpga/intel-m10-bmc-sec-update.c:103 flash_count_show() warn: possib=
le memory leak of 'flash_buf'

vim +/flash_buf +103 drivers/fpga/intel-m10-bmc-sec-update.c

154afa5c31cd2de Russ Weight 2022-06-06   82  =

154afa5c31cd2de Russ Weight 2022-06-06   83  static ssize_t flash_count_sho=
w(struct device *dev,
154afa5c31cd2de Russ Weight 2022-06-06   84  				struct device_attribute *a=
ttr, char *buf)
154afa5c31cd2de Russ Weight 2022-06-06   85  {
154afa5c31cd2de Russ Weight 2022-06-06   86  	struct m10bmc_sec *sec =3D de=
v_get_drvdata(dev);
154afa5c31cd2de Russ Weight 2022-06-06   87  	unsigned int stride, num_bits;
154afa5c31cd2de Russ Weight 2022-06-06   88  	u8 *flash_buf;
154afa5c31cd2de Russ Weight 2022-06-06   89  	int cnt, ret;
154afa5c31cd2de Russ Weight 2022-06-06   90  =

154afa5c31cd2de Russ Weight 2022-06-06   91  	stride =3D regmap_get_reg_str=
ide(sec->m10bmc->regmap);
154afa5c31cd2de Russ Weight 2022-06-06   92  	num_bits =3D FLASH_COUNT_SIZE=
 * 8;
154afa5c31cd2de Russ Weight 2022-06-06   93  =

154afa5c31cd2de Russ Weight 2022-06-06   94  	flash_buf =3D kmalloc(FLASH_C=
OUNT_SIZE, GFP_KERNEL);
154afa5c31cd2de Russ Weight 2022-06-06   95  	if (!flash_buf)
154afa5c31cd2de Russ Weight 2022-06-06   96  		return -ENOMEM;
154afa5c31cd2de Russ Weight 2022-06-06   97  =

154afa5c31cd2de Russ Weight 2022-06-06   98  	if (FLASH_COUNT_SIZE % stride=
) {
154afa5c31cd2de Russ Weight 2022-06-06   99  		dev_err(sec->dev,
154afa5c31cd2de Russ Weight 2022-06-06  100  			"FLASH_COUNT_SIZE (0x%x) no=
t aligned to stride (0x%x)\n",
154afa5c31cd2de Russ Weight 2022-06-06  101  			FLASH_COUNT_SIZE, stride);
154afa5c31cd2de Russ Weight 2022-06-06  102  		WARN_ON_ONCE(1);
154afa5c31cd2de Russ Weight 2022-06-06 @103  		return -EINVAL;
154afa5c31cd2de Russ Weight 2022-06-06  104  	}
154afa5c31cd2de Russ Weight 2022-06-06  105  =

154afa5c31cd2de Russ Weight 2022-06-06  106  	ret =3D regmap_bulk_read(sec-=
>m10bmc->regmap, STAGING_FLASH_COUNT,
154afa5c31cd2de Russ Weight 2022-06-06  107  			       flash_buf, FLASH_COU=
NT_SIZE / stride);
154afa5c31cd2de Russ Weight 2022-06-06  108  	if (ret) {
154afa5c31cd2de Russ Weight 2022-06-06  109  		dev_err(sec->dev,
154afa5c31cd2de Russ Weight 2022-06-06  110  			"failed to read flash count=
: %x cnt %x: %d\n",
154afa5c31cd2de Russ Weight 2022-06-06  111  			STAGING_FLASH_COUNT, FLASH_=
COUNT_SIZE / stride, ret);
154afa5c31cd2de Russ Weight 2022-06-06  112  		goto exit_free;
154afa5c31cd2de Russ Weight 2022-06-06  113  	}
154afa5c31cd2de Russ Weight 2022-06-06  114  	cnt =3D num_bits - bitmap_wei=
ght((unsigned long *)flash_buf, num_bits);
154afa5c31cd2de Russ Weight 2022-06-06  115  =

154afa5c31cd2de Russ Weight 2022-06-06  116  exit_free:
154afa5c31cd2de Russ Weight 2022-06-06  117  	kfree(flash_buf);
154afa5c31cd2de Russ Weight 2022-06-06  118  =

154afa5c31cd2de Russ Weight 2022-06-06  119  	return ret ? : sysfs_emit(buf=
, "%u\n", cnt);
154afa5c31cd2de Russ Weight 2022-06-06  120  }
154afa5c31cd2de Russ Weight 2022-06-06  121  static DEVICE_ATTR_RO(flash_co=
unt);
154afa5c31cd2de Russ Weight 2022-06-06  122  =


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