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i2c: cp2615: fix serial string NULL-deref at probe

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The cp2615 driver uses the USB device serial string as the i2c adapter
name but does not make sure that the string exists.

Verify that the device has a serial number before accessing it to avoid
triggering a NULL-pointer dereference (e.g. with malicious devices).

Fixes: 4a7695429e ("i2c: cp2615: add i2c driver for Silicon Labs' CP2615 Digital Audio Bridge")
Cc: stable@vger.kernel.org	# 5.13
Cc: Bence Csókás <bence98@sch.bme.hu>
Signed-off-by: Johan Hovold <johan@kernel.org>
Reviewed-by: Bence Csókás <bence98@sch.bme.hu>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20260309075016.25612-1-johan@kernel.org
This commit is contained in:
Johan Hovold 2026-03-09 08:50:16 +01:00 committed by Andi Shyti
parent f338e77383
commit aa79f996eb
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1 changed files with 3 additions and 0 deletions
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3
drivers/i2c/busses/i2c-cp2615.c
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@ -298,6 +298,9 @@ cp2615_i2c_probe(struct usb_interface *usbif, const struct usb_device_id *id)
if (!adap)
return -ENOMEM;
if (!usbdev->serial)
return -EINVAL;
strscpy(adap->name, usbdev->serial, sizeof(adap->name));
adap->owner = THIS_MODULE;
adap->dev.parent = &usbif->dev;