ASoC: soc-dapm: Annotate struct snd_soc_dapm_widget_list with __counted_by

Prepare for the coming implementation by GCC and Clang of the __counted_by
attribute. Flexible array members annotated with __counted_by can have
their accesses bounds-checked at run-time via CONFIG_UBSAN_BOUNDS (for
array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
functions).

As found with Coccinelle[1], add __counted_by for struct snd_soc_dapm_widget_list.
Additionally, since the element count member must be set before accessing
the annotated flexible array member, move its initialization earlier.

Cc: Liam Girdwood <lgirdwood@gmail.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Jaroslav Kysela <perex@perex.cz>
Cc: Takashi Iwai <tiwai@suse.com>
Cc: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Cc: alsa-devel@alsa-project.org
Cc: linux-hardening@vger.kernel.org
Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci [1]
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/20231003232852.work.257-kees@kernel.orgSigned-off-by: Mark Brown <broonie@kernel.org>

include/sound/soc-dapm.h

@@ -717,7 +717,7 @@ struct snd_soc_dapm_context {
 /* A list of widgets associated with an object, typically a snd_kcontrol */
 struct snd_soc_dapm_widget_list {
 	int num_widgets;
-	struct snd_soc_dapm_widget *widgets[];
+	struct snd_soc_dapm_widget *widgets[] __counted_by(num_widgets);
 };
 
 #define for_each_dapm_widgets(list, i, widget)				\

sound/soc/soc-dapm.c

@@ -497,8 +497,8 @@ static int dapm_kcontrol_add_widget(struct snd_kcontrol *kcontrol,
 	if (!new_wlist)
 		return -ENOMEM;
 
-	new_wlist->widgets[n - 1] = widget;
 	new_wlist->num_widgets = n;
+	new_wlist->widgets[n - 1] = widget;
 
 	data->wlist = new_wlist;