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    Subject[PATCH 5.4 119/158] ALSA: ctl: fix error path at adding user-defined element set
    Date
    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
    @@ -1350,7 +1350,7 @@ 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,

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