ACPI: CPPC: remove initial assignment of pcc_ss_data

The initialization of pcc_ss_data from pcc_data[pcc_ss_id] before
pcc_ss_id is being range checked could lead to an out-of-bounds array
read.  This very same initialization is also being performed after
the range check on pcc_ss_id, so we can just remove this problematic
and also redundant assignment to fix the issue.

Detected by cppcheck:
warning: Value stored to 'pcc_ss_data' during its initialization is never
read

Fixes: 85b1407bf6d2 (ACPI / CPPC: Make CPPC ACPI driver aware of PCC subspace IDs)
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c
index 30e84cc..06ea474 100644 (file)
--- a/drivers/acpi/cppc_acpi.c
+++ b/drivers/acpi/cppc_acpi.c
@@ -1171,7 +1171,7 @@ int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls)
        struct cpc_desc *cpc_desc = per_cpu(cpc_desc_ptr, cpu);
        struct cpc_register_resource *desired_reg;
        int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpu);
-       struct cppc_pcc_data *pcc_ss_data = pcc_data[pcc_ss_id];
+       struct cppc_pcc_data *pcc_ss_data;
        int ret = 0;
 
        if (!cpc_desc || pcc_ss_id < 0) {