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ALSA: serial-u16550: Check card index validity at probe

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serial-u16550 driver blindly trusts that the given devptr->id value is
within the proper card index range at probe.  It's OK for the devices
the driver itself creates at the module probe time, but if the device
is bound manually via sysfs interface, this could be -1 as "none", and
this leads to OOB access for index[] and other parameters.

Add a sanity check for the card index and warn/correct it if it's a
value out of the range.

Cc: stable@vger.kernel.org
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://patch.msgid.link/20260806153227.1460166-4-tiwai@suse.de
This commit is contained in:
Takashi Iwai 2026-08-06 17:32:20 +02:00
parent f7dcecb92e
commit e0fb960b22
1 changed files with 6 additions and 0 deletions
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6
sound/drivers/serial-u16550.c
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@ -846,6 +846,12 @@ static int snd_serial_probe(struct platform_device *devptr)
int err;
int dev = devptr->id;
if (dev < 0 || dev >= SNDRV_CARDS) {
dev_warn(&devptr->dev,
"Invalid card index %d, using default 0\n", dev);
dev = 0;
}
switch (adaptor[dev]) {
case SNDRV_SERIAL_SOUNDCANVAS:
ins[dev] = 1;