[CPUFREQ] Fix memory leaks in pcc_cpufreq_do_osc

If acpi_evaluate_object() function call doesn't fail, we must kfree()
output.buffer before returning from pcc_cpufreq_do_osc().

Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Dave Jones <davej@redhat.com>

diff --git a/arch/x86/kernel/cpu/cpufreq/pcc-cpufreq.c b/arch/x86/kernel/cpu/cpufreq/pcc-cpufreq.c
index 994230d..4f6f679 100644 (file)
--- a/arch/x86/kernel/cpu/cpufreq/pcc-cpufreq.c
+++ b/arch/x86/kernel/cpu/cpufreq/pcc-cpufreq.c
@@ -368,16 +368,22 @@ static int __init pcc_cpufreq_do_osc(acpi_handle *handle)
                return -ENODEV;
 
        out_obj = output.pointer;
-       if (out_obj->type != ACPI_TYPE_BUFFER)
-               return -ENODEV;
+       if (out_obj->type != ACPI_TYPE_BUFFER) {
+               ret = -ENODEV;
+               goto out_free;
+       }
 
        errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
-       if (errors)
-               return -ENODEV;
+       if (errors) {
+               ret = -ENODEV;
+               goto out_free;
+       }
 
        supported = *((u32 *)(out_obj->buffer.pointer + 4));
-       if (!(supported & 0x1))
-               return -ENODEV;
+       if (!(supported & 0x1)) {
+               ret = -ENODEV;
+               goto out_free;
+       }
 
 out_free:
        kfree(output.pointer);