ALSA: usb-audio: Validate MS endpoint descriptors

snd_usbmidi_get_ms_info() may access beyond the border when a
malformed descriptor is passed.  This patch adds the sanity checks of
the given MS endpoint descriptors, and skips invalid ones.

Reported-by: syzbot+6bb23a5d5548b93c94aa@syzkaller.appspotmail.com
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20210510150659.17710-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/usb/midi.c b/sound/usb/midi.c
index a10ac75..649eb8d 100644 (file)
--- a/sound/usb/midi.c
+++ b/sound/usb/midi.c
@@ -1956,8 +1956,12 @@ static int snd_usbmidi_get_ms_info(struct snd_usb_midi *umidi,
                ms_ep = find_usb_ms_endpoint_descriptor(hostep);
                if (!ms_ep)
                        continue;
+               if (ms_ep->bLength <= sizeof(*ms_ep))
+                       continue;
                if (ms_ep->bNumEmbMIDIJack > 0x10)
                        continue;
+               if (ms_ep->bLength < sizeof(*ms_ep) + ms_ep->bNumEmbMIDIJack)
+                       continue;
                if (usb_endpoint_dir_out(ep)) {
                        if (endpoints[epidx].out_ep) {
                                if (++epidx >= MIDI_MAX_ENDPOINTS) {