fixes for talos report TALOS-2021-1297 (#1814):
fixes for talos report TALOS-2021-1297 (#1814):

adds checks for size_t overflow on 32bits archs on calls to malloc()

includes fixes for:

CVE-2021-21834
CVE-2021-21835
CVE-2021-21836
CVE-2021-21837
CVE-2021-21838
CVE-2021-21839
CVE-2021-21840
CVE-2021-21841
CVE-2021-21842
CVE-2021-21843
CVE-2021-21844
CVE-2021-21845
CVE-2021-21846
CVE-2021-21847
CVE-2021-21848
CVE-2021-21849
CVE-2021-21850
CVE-2021-21851
CVE-2021-21852

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