ALSA: usb-audio: Validate MS endpoint descriptors

Message ID 20210510150659.17710-1-tiwai@suse.de
State Accepted
Commit e84749a78dc82bc545f12ce009e3dbcc2c5a8a91
Headers show
Series
  • ALSA: usb-audio: Validate MS endpoint descriptors
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Commit Message

Takashi Iwai May 10, 2021, 3:06 p.m.
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>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 sound/usb/midi.c | 4 ++++
 1 file changed, 4 insertions(+)

Patch

diff --git a/sound/usb/midi.c b/sound/usb/midi.c
index a10ac75969a8..649eb8d1ab7d 100644
--- 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) {