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ASoC: dapm: fix bounds checker error in dapm_widget_list_create

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The widgets array in the snd_soc_dapm_widget_list has a __counted_by
attribute attached to it, which points to the num_widgets variable. This
attribute is used in bounds checking, and if it is not set before the
array is filled, then the bounds sanitizer will issue a warning or a
kernel panic if CONFIG_UBSAN_TRAP is set.

This patch sets the size of the widgets list calculated with
list_for_each as the initial value for num_widgets as it is used for
allocating memory for the array. It is updated with the actual number of
added elements after the array is filled.

Signed-off-by: Aleksei Vetrov <vvvvvv@google.com>
Fixes: 80e698e2df ("ASoC: soc-dapm: Annotate struct snd_soc_dapm_widget_list with __counted_by")
Link: https://patch.msgid.link/20241028-soc-dapm-bounds-checker-fix-v1-1-262b0394e89e@google.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Aleksei Vetrov 2024-10-28 22:50:30 +00:00 committed by Mark Brown
parent c1895ba181
commit 2ef9439f7a
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1 changed files with 2 additions and 0 deletions
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2
sound/soc/soc-dapm.c
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@ -1147,6 +1147,8 @@ static int dapm_widget_list_create(struct snd_soc_dapm_widget_list **list,
if (*list == NULL)
return -ENOMEM;
(*list)->num_widgets = size;
list_for_each_entry(w, widgets, work_list)
(*list)->widgets[i++] = w;