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Subject[PATCH 5.0 028/238] acpi/nfit: Fix bus command validation
Date
5.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dan Williams <dan.j.williams@intel.com>

commit ebe9f6f19d80d8978d16078dff3d5bd93ad8d102 upstream.

Commit 11189c1089da "acpi/nfit: Fix command-supported detection" broke
ND_CMD_CALL for bus-level commands. The "func = cmd" assumption is only
valid for:

ND_CMD_ARS_CAP
ND_CMD_ARS_START
ND_CMD_ARS_STATUS
ND_CMD_CLEAR_ERROR

The function number otherwise needs to be pulled from the command
payload for:

NFIT_CMD_TRANSLATE_SPA
NFIT_CMD_ARS_INJECT_SET
NFIT_CMD_ARS_INJECT_CLEAR
NFIT_CMD_ARS_INJECT_GET

Update cmd_to_func() for the bus case and call it in the common path.

Fixes: 11189c1089da ("acpi/nfit: Fix command-supported detection")
Cc: <stable@vger.kernel.org>
Reviewed-by: Vishal Verma <vishal.l.verma@intel.com>
Reported-by: Grzegorz Burzynski <grzegorz.burzynski@intel.com>
Tested-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/acpi/nfit/core.c | 22 ++++++++++++----------
1 file changed, 12 insertions(+), 10 deletions(-)

--- a/drivers/acpi/nfit/core.c
+++ b/drivers/acpi/nfit/core.c
@@ -415,7 +415,7 @@ static int cmd_to_func(struct nfit_mem *
if (call_pkg) {
int i;

- if (nfit_mem->family != call_pkg->nd_family)
+ if (nfit_mem && nfit_mem->family != call_pkg->nd_family)
return -ENOTTY;

for (i = 0; i < ARRAY_SIZE(call_pkg->nd_reserved2); i++)
@@ -424,6 +424,10 @@ static int cmd_to_func(struct nfit_mem *
return call_pkg->nd_command;
}

+ /* In the !call_pkg case, bus commands == bus functions */
+ if (!nfit_mem)
+ return cmd;
+
/* Linux ND commands == NVDIMM_FAMILY_INTEL function numbers */
if (nfit_mem->family == NVDIMM_FAMILY_INTEL)
return cmd;
@@ -454,17 +458,18 @@ int acpi_nfit_ctl(struct nvdimm_bus_desc
if (cmd_rc)
*cmd_rc = -EINVAL;

+ if (cmd == ND_CMD_CALL)
+ call_pkg = buf;
+ func = cmd_to_func(nfit_mem, cmd, call_pkg);
+ if (func < 0)
+ return func;
+
if (nvdimm) {
struct acpi_device *adev = nfit_mem->adev;

if (!adev)
return -ENOTTY;

- if (cmd == ND_CMD_CALL)
- call_pkg = buf;
- func = cmd_to_func(nfit_mem, cmd, call_pkg);
- if (func < 0)
- return func;
dimm_name = nvdimm_name(nvdimm);
cmd_name = nvdimm_cmd_name(cmd);
cmd_mask = nvdimm_cmd_mask(nvdimm);
@@ -475,12 +480,9 @@ int acpi_nfit_ctl(struct nvdimm_bus_desc
} else {
struct acpi_device *adev = to_acpi_dev(acpi_desc);

- func = cmd;
cmd_name = nvdimm_bus_cmd_name(cmd);
cmd_mask = nd_desc->cmd_mask;
- dsm_mask = cmd_mask;
- if (cmd == ND_CMD_CALL)
- dsm_mask = nd_desc->bus_dsm_mask;
+ dsm_mask = nd_desc->bus_dsm_mask;
desc = nd_cmd_bus_desc(cmd);
guid = to_nfit_uuid(NFIT_DEV_BUS);
handle = adev->handle;

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