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SubjectRe: [PATCH 1/3] ASoC: Intel: catpt: remove check of list iterator against head past the loop body
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On 2022-03-31 11:50 PM, Jakob Koschel wrote:
> When list_for_each_entry() completes the iteration over the whole list
> without breaking the loop, the iterator value will be a bogus pointer
> computed based on the head element.
>
> While it is safe to use the pointer to determine if it was computed
> based on the head element, either with list_entry_is_head() or
> &pos->member == head, using the iterator variable after the loop should
> be avoided.
>
> In preparation to limiting the scope of a list iterator to the list
> traversal loop, use a dedicated pointer to point to the found element [1].
>
> Link: https://lore.kernel.org/all/CAHk-=wgRr_D8CB-D9Kg-c=EHreAsk5SqXPwr9Y7k9sA6cWXJ6w@mail.gmail.com/ [1]
> Signed-off-by: Jakob Koschel <jakobkoschel@gmail.com>

Thank you for taking time and updating catpt-driver along the way.

Acked-by: Cezary Rojewski <cezary.rojewski@intel.com>

> ---
> sound/soc/intel/catpt/pcm.c | 13 ++++++++-----
> 1 file changed, 8 insertions(+), 5 deletions(-)
>
> diff --git a/sound/soc/intel/catpt/pcm.c b/sound/soc/intel/catpt/pcm.c
> index a26000cd5ceb..b103b2d4026e 100644
> --- a/sound/soc/intel/catpt/pcm.c
> +++ b/sound/soc/intel/catpt/pcm.c
> @@ -330,7 +330,8 @@ static int catpt_dai_apply_usettings(struct snd_soc_dai *dai,
> struct catpt_stream_runtime *stream)
> {
> struct snd_soc_component *component = dai->component;
> - struct snd_kcontrol *pos;
> + struct snd_kcontrol *pos = NULL;
> + struct snd_kcontrol *iter;
> struct catpt_dev *cdev = dev_get_drvdata(dai->dev);
> const char *name;
> int ret;
> @@ -354,12 +355,14 @@ static int catpt_dai_apply_usettings(struct snd_soc_dai *dai,
> return 0;
> }
>
> - list_for_each_entry(pos, &component->card->snd_card->controls, list) {
> - if (pos->private_data == component &&
> - !strncmp(name, pos->id.name, sizeof(pos->id.name)))
> + list_for_each_entry(iter, &component->card->snd_card->controls, list) {
> + if (iter->private_data == component &&
> + !strncmp(name, iter->id.name, sizeof(iter->id.name))) {
> + pos = iter;
> break;
> + }
> }
> - if (list_entry_is_head(pos, &component->card->snd_card->controls, list))
> + if (!pos)
> return -ENOENT;
>
> if (stream->template->type != CATPT_STRM_TYPE_LOOPBACK)
>
> base-commit: f82da161ea75dc4db21b2499e4b1facd36dab275

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