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ALSA: usb-audio: Fix NULL pointer deference in try_to_register_card

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In try_to_register_card(), the return value of usb_ifnum_to_if() is
passed directly to usb_interface_claimed() without a NULL check, which
will lead to a NULL pointer dereference when creating an invalid
USB audio device. Fix this by adding a check to ensure the interface
pointer is valid before passing it to usb_interface_claimed().

Fixes: 39efc9c8a9 ("ALSA: usb-audio: Fix last interface check for registration")
Closes: https://lore.kernel.org/all/CANypQFYtQxHL5ghREs-BujZG413RPJGnO5TH=xjFBKpPts33tA@mail.gmail.com/
Signed-off-by: Jiaming Zhang <r772577952@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Jiaming Zhang
2025-10-15 13:16:45 +08:00
committed by Takashi Iwai
parent d41f68dff7
commit 28412b489b
1 changed files with 8 additions and 2 deletions
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10
sound/usb/card.c
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@@ -891,10 +891,16 @@ get_alias_quirk(struct usb_device *dev, unsigned int id)
*/
static int try_to_register_card(struct snd_usb_audio *chip, int ifnum)
{
struct usb_interface *iface;
if (check_delayed_register_option(chip) == ifnum ||
chip->last_iface == ifnum ||
usb_interface_claimed(usb_ifnum_to_if(chip->dev, chip->last_iface)))
chip->last_iface == ifnum)
return snd_card_register(chip->card);
iface = usb_ifnum_to_if(chip->dev, chip->last_iface);
if (iface && usb_interface_claimed(iface))
return snd_card_register(chip->card);
return 0;
}