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nfit: fix smatch "use after null check" report 

drivers/acpi/nfit.c:1224 acpi_nfit_blk_region_enable()
         error: we previously assumed 'nfit_mem' could be null (see line 1223)

drivers/acpi/nfit.c
  1222          nfit_mem = nvdimm_provider_data(nvdimm);
  1223          if (!nfit_mem || !nfit_mem->dcr || !nfit_mem->bdw) {
                     ^^^^^^^^
Check.

  1224                  dev_dbg(dev, "%s: missing%s%s%s\n", __func__,
  1225                                  nfit_mem ? "" : " nfit_mem",
  1226                                  nfit_mem->dcr ? "" : " dcr",
                                        ^^^^^^^^^^^^^
Unchecked dereference.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
hifive-unleashed-5.1
Dan Williams 2015-06-30 16:09:39 -04:00
parent daa1dee405
commit 193ccca438
1 changed files with 2 additions and 2 deletions
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4
drivers/acpi/nfit.c
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@ -1223,8 +1223,8 @@ static int acpi_nfit_blk_region_enable(struct nvdimm_bus *nvdimm_bus,
if (!nfit_mem || !nfit_mem->dcr || !nfit_mem->bdw) {
dev_dbg(dev, "%s: missing%s%s%s\n", __func__,
nfit_mem ? "" : " nfit_mem",
nfit_mem->dcr ? "" : " dcr",
nfit_mem->bdw ? "" : " bdw");
(nfit_mem && nfit_mem->dcr) ? "" : " dcr",
(nfit_mem && nfit_mem->bdw) ? "" : " bdw");
return -ENXIO;
}