From: Takashi Sakamoto o-takashi@sakamocchi.jp
commit 95a793c3bc75cf888e0e641d656e7d080f487d8b upstream.
When processing request to add/replace user-defined element set, check of given element identifier and decision of numeric identifier is done in "__snd_ctl_add_replace()" helper function. When the result of check is wrong, the helper function returns error code. The error code shall be returned to userspace application.
Current implementation includes bug to return zero to userspace application regardless of the result. This commit fixes the bug.
Cc: stable@vger.kernel.org Fixes: e1a7bfe38079 ("ALSA: control: Fix race between adding and removing a user element") Signed-off-by: Takashi Sakamoto o-takashi@sakamocchi.jp Link: https://lore.kernel.org/r/20201113092043.16148-1-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai tiwai@suse.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- sound/core/control.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/sound/core/control.c +++ b/sound/core/control.c @@ -1387,7 +1387,7 @@ static int snd_ctl_elem_add(struct snd_c
unlock: up_write(&card->controls_rwsem); - return 0; + return err; }
static int snd_ctl_elem_add_user(struct snd_ctl_file *file,