[PATCH v2 4/4] mtd: rawnand: brcmnand: Fix potential out-of-bounds access in oob write

[kernel test robot]

Hi William,

kernel test robot noticed the following build warnings:

[auto build test WARNING on mtd/nand/next]
[also build test WARNING on linus/master v6.4-rc7 next-20230619]
[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/William-Zhang/mtd-rawnand-brcmnand-Fix-ECC-level-field-setting-for-v7-2-controller/20230617-103050
base:   https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git nand/next
patch link:    https://lore.kernel.org/r/20230617022920.67173-5-william.zhang%40broadcom.com
patch subject: [PATCH v2 4/4] mtd: rawnand: brcmnand: Fix potential out-of-bounds access in oob write
config: arm64-randconfig-s043-20230619 (https://download.01.org/0day-ci/archive/20230620/202306201340.C2Y4kmFL-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 12.3.0
reproduce: (https://download.01.org/0day-ci/archive/20230620/202306201340.C2Y4kmFL-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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202306201340.C2Y4kmFL-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> drivers/mtd/nand/raw/brcmnand/brcmnand.c:1500:54: sparse: sparse: incorrect type in argument 3 (different base types) @@     expected unsigned int [usertype] data @@     got restricted __be32 [usertype] @@
   drivers/mtd/nand/raw/brcmnand/brcmnand.c:1500:54: sparse:     expected unsigned int [usertype] data
   drivers/mtd/nand/raw/brcmnand/brcmnand.c:1500:54: sparse:     got restricted __be32 [usertype]
   drivers/mtd/nand/raw/brcmnand/brcmnand.c:1836:42: sparse: sparse: cast to restricted __be32
   drivers/mtd/nand/raw/brcmnand/brcmnand.c:1836:42: sparse: sparse: cast to restricted __be32
   drivers/mtd/nand/raw/brcmnand/brcmnand.c:1836:42: sparse: sparse: cast to restricted __be32
   drivers/mtd/nand/raw/brcmnand/brcmnand.c:1836:42: sparse: sparse: cast to restricted __be32
   drivers/mtd/nand/raw/brcmnand/brcmnand.c:1836:42: sparse: sparse: cast to restricted __be32
   drivers/mtd/nand/raw/brcmnand/brcmnand.c:1836:42: sparse: sparse: cast to restricted __be32
   drivers/mtd/nand/raw/brcmnand/brcmnand.c:2065:41: sparse: sparse: dubious: x | !y

vim +1500 drivers/mtd/nand/raw/brcmnand/brcmnand.c

  1468	
  1469	/*
  1470	 * write_oob_to_regs - write data to OOB registers
  1471	 * @i: sub-page sector index
  1472	 * @oob: buffer to write from
  1473	 * @sas: spare area sector size (i.e., OOB size per FLASH_CACHE)
  1474	 * @sector_1k: 1 for 1KiB sectors, 0 for 512B, other values are illegal
  1475	 */
  1476	static int write_oob_to_regs(struct brcmnand_controller *ctrl, int i,
  1477				     const u8 *oob, int sas, int sector_1k)
  1478	{
  1479		int tbytes = sas << sector_1k;
  1480		int j, k = 0;
  1481		u32 last = 0xffffffff;
  1482		u8 *plast = (u8 *)&last;
  1483	
  1484		/* Adjust OOB values for 1K sector size */
  1485		if (sector_1k && (i & 0x01))
  1486			tbytes = max(0, tbytes - (int)ctrl->max_oob);
  1487		tbytes = min_t(int, tbytes, ctrl->max_oob);
  1488	
  1489		for (j = 0; (j + 3) < tbytes; j += 4)
  1490			oob_reg_write(ctrl, j,
  1491					(oob[j + 0] << 24) |
  1492					(oob[j + 1] << 16) |
  1493					(oob[j + 2] <<  8) |
  1494					(oob[j + 3] <<  0));
  1495	
  1496		while (j < tbytes)
  1497			plast[k++] = oob[j++];
  1498	
  1499		if (tbytes & 0x3)
> 1500			oob_reg_write(ctrl, (tbytes & ~0x3), cpu_to_be32(last));
  1501	
  1502		return tbytes;
  1503	}
  1504	

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