[RFC v2] ALSA: control: fix a error handling exist in snd_ctl_elem_add

CVE-2020-11725 report that 'count = info->owner' may result a SIZE_OVERFLOW. 'info->owner' represent a pid, and actually, we should use info->count.

Signed-off-by: yangerkun yangerkun@huawei.com --- sound/core/control.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

v1->v2: reword the patch head

diff --git a/sound/core/control.c b/sound/core/control.c index aa0c0cf182af..c77ca7f39637 100644 --- a/sound/core/control.c +++ b/sound/core/control.c @@ -1431,7 +1431,7 @@ static int snd_ctl_elem_add(struct snd_ctl_file *file, return -ENOMEM;

/* Check the number of elements for this userspace control. */ - count = info->owner; + count = info->count; if (count == 0) count = 1;