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ALSA: usb-audio: Check endpoint numbers at parsing Scarlett2 mixer interfaces

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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>
This commit is contained in:
Takashi Iwai
2026-03-09 11:46:27 +01:00
parent 542127f652
commit df1d8abf36
1 changed files with 2 additions and 0 deletions
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2
sound/usb/mixer_scarlett2.c
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@@ -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;