linux-kernel - [PATCH] ALSA: usb-midi: fix a memory leak bug

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Message-ID: <CAAa=b7ebEkQZhPCbJPK=dVC+cR8_pTE3OOxX+PV+MNx7-Y25Cw@mail.gmail.com>
Date:   Tue, 6 Aug 2019 23:22:09 -0400
From:   Wenwen Wang <wenwen@...uga.edu>
To:     Wenwen Wang <wenwen@...uga.edu>
Cc:     Clemens Ladisch <clemens@...isch.de>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        "moderated list:SOUND" <alsa-devel@...a-project.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: [PATCH] ALSA: usb-midi: fix a memory leak bug

In __snd_usbmidi_create(), a MIDI streaming interface structure is
allocated through kzalloc() and the pointer is saved to 'umidi'. Later on,
the endpoint structures are created by invoking
snd_usbmidi_create_endpoints_midiman() or snd_usbmidi_create_endpoints(),
depending on the type of the audio quirk type. However, if the creation
fails, the allocated 'umidi' is not deallocated, leading to a memory leak
bug.

To fix the above issue, free 'umidi' before returning the error.

Signed-off-by: Wenwen Wang <wenwen@...uga.edu>
---
 sound/usb/midi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/usb/midi.c b/sound/usb/midi.c
index b737f0e..22db37f 100644
--- a/sound/usb/midi.c
+++ b/sound/usb/midi.c
@@ -2476,7 +2476,7 @@ int __snd_usbmidi_create(struct snd_card *card,
        else
                err = snd_usbmidi_create_endpoints(umidi, endpoints);
        if (err < 0)
-               goto exit;
+               goto free_midi;

        usb_autopm_get_interface_no_resume(umidi->iface);

-- 
2.7.4