There was no check about the id string of user control elements, so we accepted even a control element with an empty string, which is obviously bogus. This patch adds more sanity checks of id strings.
Cc: stable@vger.kernel.org Signed-off-by: Takashi Iwai tiwai@suse.de --- sound/core/control.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/sound/core/control.c b/sound/core/control.c index 35324a8e83c8..7ed2b214b16d 100644 --- a/sound/core/control.c +++ b/sound/core/control.c @@ -1170,6 +1170,10 @@ static int snd_ctl_elem_add(struct snd_ctl_file *file,
if (info->count < 1) return -EINVAL; + if (*info->id.name) + return -EINVAL; + if (strnlen(info->id.name, sizeof(info->id.name)) > sizeof(info->id.name)) + return -EINVAL; access = info->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE : (info->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE| SNDRV_CTL_ELEM_ACCESS_INACTIVE|