[linux-nvme:nvme-5.9-rc 14/14] drivers/nvme/host/zns.c:170:46: warning: Uninitialized variable: buflen

[kernel test robot]

tree:   git://git.infradead.org/nvme.git nvme-5.9-rc
head:   cd83b396e350d2f13bd2ad81565255f77a13aa3a
commit: cd83b396e350d2f13bd2ad81565255f77a13aa3a [14/14] nvme: fix error handling in nvme_ns_report_zones
compiler: sparc64-linux-gcc (GCC) 9.3.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp at intel.com>


cppcheck warnings: (new ones prefixed by >>)

>> drivers/nvme/host/zns.c:170:46: warning: Uninitialized variable: buflen [uninitvar]
    c.zmr.numd = cpu_to_le32(nvme_bytes_to_numd(buflen));
                                                ^
>> drivers/nvme/host/nvme.h:523:10: warning: Uninitialized variable: len [uninitvar]
    return (len >> 2) - 1;
            ^

git remote add linux-nvme git://git.infradead.org/nvme.git
git fetch --no-tags linux-nvme nvme-5.9-rc
git checkout cd83b396e350d2f13bd2ad81565255f77a13aa3a
vim +170 drivers/nvme/host/zns.c

   158	
   159	static int nvme_ns_report_zones(struct nvme_ns *ns, sector_t sector,
   160				unsigned int nr_zones, report_zones_cb cb, void *data)
   161	{
   162		struct nvme_zone_report *report;
   163		struct nvme_command c = { };
   164		int ret, zone_idx = 0;
   165		unsigned int nz, i;
   166		size_t buflen;
   167	
   168		c.zmr.opcode = nvme_cmd_zone_mgmt_recv;
   169		c.zmr.nsid = cpu_to_le32(ns->head->ns_id);
 > 170		c.zmr.numd = cpu_to_le32(nvme_bytes_to_numd(buflen));
   171		c.zmr.zra = NVME_ZRA_ZONE_REPORT;
   172		c.zmr.zrasf = NVME_ZRASF_ZONE_REPORT_ALL;
   173		c.zmr.pr = NVME_REPORT_ZONE_PARTIAL;
   174	
   175		report = nvme_zns_alloc_report_buffer(ns, nr_zones, &buflen);
   176		if (!report)
   177			return -ENOMEM;
   178	
   179		sector &= ~(ns->zsze - 1);
   180		while (zone_idx < nr_zones && sector < get_capacity(ns->disk)) {
   181			memset(report, 0, buflen);
   182	
   183			c.zmr.slba = cpu_to_le64(nvme_sect_to_lba(ns, sector));
   184			ret = nvme_submit_sync_cmd(ns->queue, &c, report, buflen);
   185			if (ret)
   186				goto out_free;
   187	
   188			nz = min((unsigned int)le64_to_cpu(report->nr_zones), nr_zones);
   189			if (!nz)
   190				break;
   191	
   192			for (i = 0; i < nz && zone_idx < nr_zones; i++) {
   193				ret = nvme_zone_parse_entry(ns, &report->entries[i],
   194							    zone_idx, cb, data);
   195				if (ret)
   196					goto out_free;
   197				zone_idx++;
   198			}
   199	
   200			sector += ns->zsze * nz;
   201		}
   202	
   203		if (zone_idx > 0)
   204			ret = zone_idx;
   205		else
   206			ret = -EINVAL;
   207	out_free:
   208		kvfree(report);
   209		return ret;
   210	}
   211	

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