watchdog: ziirave_wdt: check record length in ziirave_firm_verify()

The "rec->len" value comes from the firmware.  We generally do
trust firmware, but it's always better to double check.  If
the length value is too large it would lead to memory corruption
when we set "data[i] = ret;"

Fixes: 217209d ("watchdog: ziirave_wdt: Add support to upload the firmware.")
Signed-off-by: Dan Carpenter <[email protected]>
Reviewed-by: Guenter Roeck <[email protected]>
Link: https://lore.kernel.org/r/3b58b453f0faa8b968c90523f52c11908b56c346.1748463049.git.dan.carpenter@linaro.org
Signed-off-by: Guenter Roeck <[email protected]>
Signed-off-by: Wim Van Sebroeck <[email protected]>

Author: Dan Carpenter

drivers/watchdog/ziirave_wdt.c

@@ -302,6 +302,9 @@ static int ziirave_firm_verify(struct watchdog_device *wdd,
 		const u16 len = be16_to_cpu(rec->len);
 		const u32 addr = be32_to_cpu(rec->addr);
 
+		if (len > sizeof(data))
+			return -EINVAL;
+
 		if (ziirave_firm_addr_readonly(addr))
 			continue;