The length should be checked before the PMU_STR_INS_INDEX(th) character is accessed, otherwise it is going to an access violation. Change-Id: I8b59eb34e1cb01fd6e2571fcebc28ef2084b6ec4 Signed-off-by: Zheng Bao <fishbaozi@gmail.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/62249 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Felix Held <felix-coreboot@felixheld.de>