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 <vvv...@google.com>
---
sound/soc/soc-dapm.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index
c34934c31ffec3970b34b24dcaa0826dfb7d8e86..99521c784a9b16a232a558029a2f3e88bd8ebfb1
100644
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -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;
---
base-commit: 81983758430957d9a5cb3333fe324fd70cf63e7e
change-id: 20241028-soc-dapm-bounds-checker-fix-5bae621455b2
Best regards,
--
Aleksei Vetrov <vvv...@google.com>
