ALSA: usb-audio: fix use-after-free in ump_to_endpoint()

create_midi2_ump() registers a card-owned snd_ump_endpoint and stores a
back-pointer to its per-interface snd_usb_midi2_ump object in
ump->private_data, but it never installs an ump->private_free hook and
never clears that pointer.

If a later step of snd_usb_midi_v2_create() fails, its error path calls
free_all_midi2_umps(), which kfree()s the snd_usb_midi2_ump object while
the already-registered endpoint keeps pointing at it.  The created
/dev/snd/umpC*D* node stays exposed, so the first operation of any UMP
open, ump_to_endpoint(), dereferences the dangling ump->private_data and
reads rmidi->eps[dir] out of freed memory.

A malicious USB MIDI 2.0 device that makes creation fail after the
endpoint is registered can thus trigger a slab use-after-free read on a
subsequent open of the UMP node.

Clear the endpoint's back-pointer before freeing the object, and let
ump_to_endpoint() tolerate a NULL private_data so the open/close/trigger
callbacks fail cleanly (their callers already handle a NULL endpoint)
instead of dereferencing a stale pointer.

Discovered by XBOW, triaged by Baul Lee <baul.lee@xbow.com>

Fixes: ff49d1df79ae ("ALSA: usb-audio: USB MIDI 2.0 UMP support")
Reported-by: Federico Kirschbaum <federico.kirschbaum@xbow.com>
Reported-by: Baul Lee <baul.lee@xbow.com>
Cc: stable@vger.kernel.org
Signed-off-by: Baul Lee <baul.lee@xbow.com>
Link: https://patch.msgid.link/20260726051337.41124-1-baul.lee@xbow.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/usb/midi2.c b/sound/usb/midi2.c
index 3ec633291772671a70536123734baeb0e06ed2ee..83980fb83ac84b86e4dcae8d1c634ed4ff1d12ae 100644 (file)
--- a/sound/usb/midi2.c
+++ b/sound/usb/midi2.c
@@ -329,7 +329,7 @@ ump_to_endpoint(struct snd_ump_endpoint *ump, int dir)
 {
        struct snd_usb_midi2_ump *rmidi = ump->private_data;
 
-       return rmidi->eps[dir];
+       return rmidi ? rmidi->eps[dir] : NULL;
 }
 
 /* ump open callback */
@@ -685,6 +685,8 @@ static void free_all_midi2_umps(struct snd_usb_midi2_interface *umidi)
                rmidi = list_first_entry(&umidi->rawmidi_list,
                                         struct snd_usb_midi2_ump, list);
                list_del(&rmidi->list);
+               if (rmidi->ump)
+                       rmidi->ump->private_data = NULL;
                kfree(rmidi);
        }
 }