CVE-2026-68356

In the Linux kernel, the following vulnerability has been resolved:

watchdog: airoha: Prevent division by zero when clock frequency is zero

clkgetrate() can return 0 when the clock provider is not properly configured or the clock is unmanaged. The driver uses wdtfreq as a divisor directly in airohawdtprobe() to compute maxtimeout and in airohawdtget_timeleft() to compute the remaining time, which results in a division by zero.

Add a check for wdtfreq == 0 in probe and return -EINVAL with deverr_probe() to prevent the division by zero and provide a diagnostic message.