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| author | Dave Jiang <dave.jiang@intel.com> | 2018-07-11 20:10:11 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-08-24 14:07:07 +0300 |
| commit | 3cba6052bb9e5d0422a0ccf34e2033e7575d5517 (patch) | |
| tree | c1361ee8b1c23dc1607237874ce176aa62b71cf6 | |
| parent | 6ab0a8948f67d1740431da613c707c15068b6674 (diff) | |
| download | linux-3cba6052bb9e5d0422a0ccf34e2033e7575d5517.tar.xz | |
nfit: fix unchecked dereference in acpi_nfit_ctl
[ 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>
| -rw-r--r-- | drivers/acpi/nfit/core.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c index 98b38203bfa3..3b1651426e12 100644 --- a/drivers/acpi/nfit/core.c +++ b/drivers/acpi/nfit/core.c @@ -408,7 +408,8 @@ int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc, struct nvdimm *nvdimm, const guid_t *guid; int rc, i; - *cmd_rc = -EINVAL; + if (cmd_rc) + *cmd_rc = -EINVAL; func = cmd; if (cmd == ND_CMD_CALL) { call_pkg = buf; @@ -519,7 +520,8 @@ 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; } |