5.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: Takashi Iwai commit 3690ef20469d5959378260e2752f2314a2572913 upstream. Although portman2x4 driver has a check of the given devptr->id value, it doesn't check for a negative id, which is often given as "none" or such value when bound via sysfs. This may lead 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 Link: https://patch.msgid.link/20260806153227.1460166-7-tiwai@suse.de Signed-off-by: Greg Kroah-Hartman --- sound/drivers/portman2x4.c | 6 ++++++ 1 file changed, 6 insertions(+) --- a/sound/drivers/portman2x4.c +++ b/sound/drivers/portman2x4.c @@ -716,6 +716,12 @@ static int snd_portman_probe(struct plat p = platform_get_drvdata(pdev); platform_set_drvdata(pdev, NULL); + if (dev < 0) { + dev_warn(&pdev->dev, + "Invalid card index %d, using default 0\n", dev); + dev = 0; + } + if (dev >= SNDRV_CARDS) return -ENODEV; if (!enable[dev])