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nfit: fix unchecked dereference in acpi_nfit_ctl

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[ Upstream commit ee6581ceba7f8314b81b2f2a81f1cf3f67c679e2 ]

Incremental patch to fix the unchecked dereference in acpi_nfit_ctl.
Reported by Dan Carpenter:

"acpi/nfit: fix cmd_rc for acpi_nfit_ctl to
always return a value" from Jun 28, 2018, leads to the following
Smatch complaint:

    drivers/acpi/nfit/core.c:578 acpi_nfit_ctl()
     warn: variable dereferenced before check 'cmd_rc' (see line 411)

drivers/acpi/nfit/core.c
   410
   411		*cmd_rc = -EINVAL;
                ^^^^^^^^^^^^^^^^^^
Patch adds unchecked dereference.

Fixes: c1985cefd844 ("acpi/nfit: fix cmd_rc for acpi_nfit_ctl to always return a value")

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dave Jiang 2018-07-11 10:10:11 -07:00 committed by Greg Kroah-Hartman
parent b81825b74d
commit 8e4449f431
1 changed files with 4 additions and 2 deletions
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6
drivers/acpi/nfit/core.c
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@ -201,7 +201,8 @@ int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc, struct nvdimm *nvdimm,
const u8 *uuid;
int rc, i;
*cmd_rc = -EINVAL;
if (cmd_rc)
*cmd_rc = -EINVAL;
func = cmd;
if (cmd == ND_CMD_CALL) {
call_pkg = buf;
@ -289,7 +290,8 @@ int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc, struct nvdimm *nvdimm,
* If we return an error (like elsewhere) then caller wouldn't
* be able to rely upon data returned to make calculation.
*/
*cmd_rc = 0;
if (cmd_rc)
*cmd_rc = 0;
return 0;
}