platform/x86: ideapad-laptop: fix a NULL pointer dereference

The third parameter of dytc_cql_command should not be NULL since it will
be dereferenced immediately.

Fixes: ff36b0d953dc4 ("platform/x86: ideapad-laptop: rework and create new ACPI helpers")
Signed-off-by: Qiu Wenbo <qiuwenbo@kylinos.com.cn>
Acked-by: Ike Panhc <ike.pan@canonical.com>
Link: https://lore.kernel.org/r/20210428050636.8003-1-qiuwenbo@kylinos.com.cn
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

diff --git a/drivers/platform/x86/ideapad-laptop.c b/drivers/platform/x86/ideapad-laptop.c
index 6cb5ad4..8f87115 100644 (file)
--- a/drivers/platform/x86/ideapad-laptop.c
+++ b/drivers/platform/x86/ideapad-laptop.c
@@ -809,6 +809,7 @@ static int dytc_profile_set(struct platform_profile_handler *pprof,
 {
        struct ideapad_dytc_priv *dytc = container_of(pprof, struct ideapad_dytc_priv, pprof);
        struct ideapad_private *priv = dytc->priv;
+       unsigned long output;
        int err;
 
        err = mutex_lock_interruptible(&dytc->mutex);
@@ -829,7 +830,7 @@ static int dytc_profile_set(struct platform_profile_handler *pprof,
 
                /* Determine if we are in CQL mode. This alters the commands we do */
                err = dytc_cql_command(priv, DYTC_SET_COMMAND(DYTC_FUNCTION_MMC, perfmode, 1),
-                                      NULL);
+                                      &output);
                if (err)
                        goto unlock;
        }