staging: greybus: audio: fix loop cursor use after iteration

gbaudio_dapm_free_controls() iterates over widgets using
list_for_each_entry_safe(), which leaves the loop cursor pointing to a
meaningless structure if it completes a traversal of the list. The
cursor was set to NULL at the end of the loop body, but would be
overwritten by the final loop cursor update.

Because of this behavior, the widget could be non-null after the loop
even if the widget wasn't found, and the cleanup logic would treat the
pointer as a valid widget to free.

To fix this, introduce a temporary variable to act as the loop cursor
and copy it to a variable that can be accessed after the loop finishes.

This was detected with the help of Coccinelle.
Signed-off-by: Jared Kangas <kangas.jd@gmail.com>
Link: https://lore.kernel.org/r/20220605231806.720085-1-kangas.jd@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/greybus/audio_helper.c

@@ -115,7 +115,7 @@ int gbaudio_dapm_free_controls(struct snd_soc_dapm_context *dapm,
 			       int num)
 {
 	int i;
-	struct snd_soc_dapm_widget *w, *next_w;
+	struct snd_soc_dapm_widget *w, *next_w, *tmp_w;
 #ifdef CONFIG_DEBUG_FS
 	struct dentry *parent = dapm->debugfs_dapm;
 	struct dentry *debugfs_w = NULL;
@@ -124,13 +124,14 @@ int gbaudio_dapm_free_controls(struct snd_soc_dapm_context *dapm,
 	mutex_lock(&dapm->card->dapm_mutex);
 	for (i = 0; i < num; i++) {
 		/* below logic can be optimized to identify widget pointer */
-		list_for_each_entry_safe(w, next_w, &dapm->card->widgets,
+		w = NULL;
+		list_for_each_entry_safe(tmp_w, next_w, &dapm->card->widgets,
 					 list) {
-			if (w->dapm != dapm)
-				continue;
-			if (!strcmp(w->name, widget->name))
+			if (tmp_w->dapm == dapm &&
+			    !strcmp(tmp_w->name, widget->name)) {
+				w = tmp_w;
 				break;
-			w = NULL;
+			}
 		}
 		if (!w) {
 			dev_err(dapm->dev, "%s: widget not found\n",