There are some usages of index pointer of list(w) which may not point to the right entry when the required entry is not found and the list traversal completes with index pointer pointing to the last entry. So, use w_found flag to track the case where the entry is found.
Currently, When the condition (w->dapm != dapm) is true the loop continues and when it is not then it compares the name strings and breaks out of the loop if they match with w pointing to the right entry and it also breaks out of loop if they didn't match by additionally setting w to NULL. But what if the condition (w->dapm != dapm) is never false and the list traversal completes with w pointing to last entry then usage of it after the iter may not be correct. And there is no way to know whether the entry is found. So, if we introduce w_found to track when the entry is found then we can account for the case where the entry is not actually found and the list traversal completes.
Fixes coccinelle error: drivers/staging/greybus/audio_helper.c:135:7-8: ERROR: invalid reference to the index variable of the iterator on line 127
Signed-off-by: Karthik Alapati mail@karthek.com --- drivers/staging/greybus/audio_helper.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/staging/greybus/audio_helper.c b/drivers/staging/greybus/audio_helper.c index 843760675876..7c04897a22a2 100644 --- a/drivers/staging/greybus/audio_helper.c +++ b/drivers/staging/greybus/audio_helper.c @@ -116,6 +116,7 @@ int gbaudio_dapm_free_controls(struct snd_soc_dapm_context *dapm, { int i; struct snd_soc_dapm_widget *w, *next_w; + bool w_found = false; #ifdef CONFIG_DEBUG_FS struct dentry *parent = dapm->debugfs_dapm; struct dentry *debugfs_w = NULL; @@ -124,15 +125,18 @@ 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 */ + w_found = false list_for_each_entry_safe(w, next_w, &dapm->card->widgets, list) { if (w->dapm != dapm) continue; - if (!strcmp(w->name, widget->name)) + if (!strcmp(w->name, widget->name)) { + w_found = true; break; + } w = NULL; } - if (!w) { + if (!w_found) { dev_err(dapm->dev, "%s: widget not found\n", widget->name); widget++;