diff options
| author | Takashi Iwai <tiwai@suse.de> | 2026-03-09 11:46:27 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2026-03-19 16:15:00 +0100 |
| commit | 3d4f23885e4b90347c9a1d779af6e79a99b5172a (patch) | |
| tree | 726fbc8f64814ffbb74c7e1818542d30170c63ec | |
| parent | c2f64e05a0587a83ec42dbd6b7a7ded79b2ff694 (diff) | |
ALSA: usb-audio: Check endpoint numbers at parsing Scarlett2 mixer interfaces
commit df1d8abf36ca3681c21a6809eaa9a1e01ef897a6 upstream.
The Scarlett2 mixer quirk in USB-audio driver may hit a NULL
dereference when a malformed USB descriptor is passed, since it
assumes the presence of an endpoint in the parsed interface in
scarlett2_find_fc_interface(), as reported by fuzzer.
For avoiding the NULL dereference, just add the sanity check of
bNumEndpoints and skip the invalid interface.
Reported-by: syzbot+8f29539ef9a1c8334f42@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/69acbbe1.050a0220.310d8.0001.GAE@google.com
Reported-by: syzbot+ae893a8901067fde2741@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/69acf72a.050a0220.310d8.0004.GAE@google.com
Cc: <stable@vger.kernel.org>
Link: https://patch.msgid.link/20260309104632.141895-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | sound/usb/mixer_scarlett2.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/sound/usb/mixer_scarlett2.c b/sound/usb/mixer_scarlett2.c index 7b31504c5f24..4342d93ab771 100644 --- a/sound/usb/mixer_scarlett2.c +++ b/sound/usb/mixer_scarlett2.c @@ -8251,6 +8251,8 @@ static int scarlett2_find_fc_interface(struct usb_device *dev, if (desc->bInterfaceClass != 255) continue; + if (desc->bNumEndpoints < 1) + continue; epd = get_endpoint(intf->altsetting, 0); private->bInterfaceNumber = desc->bInterfaceNumber; |