Three calls to memchr() had incorrect length values which could lead to
memory overrun.
Add non-null checks to ensure correct return values from memchr()
Signed-off-by: Jakub Czapiga <jacz@semihalf.com>
Change-Id: Ief7b7e2ecb9b5d2e05e6983d92d02fa00935b392
Reviewed-on: https://review.coreboot.org/c/coreboot/+/51054
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Fagerburg <pfagerburg@chromium.org>
68220b5c42