Szabolcs Nagy
17bfe5954b
Fix OOB read in stdlib thousand grouping parsing [BZ #29727 ]
...
__correctly_grouped_prefixmb only worked with thousands_len == 1,
otherwise it read past the end of cp or thousands.
This affects scanf formats like %'d, %'f and the internal but
exposed __strto{l,ul,f,d,..}_internal with grouping flag set
and an LC_NUMERIC locale where thousands_len > 1.
Avoid OOB access by considering thousands_len when initializing cp.
This fixes bug 29727.
Found by the morello port with strict bounds checking where
FAIL: stdlib/tst-strtod4
FAIL: stdlib/tst-strtod5i
crashed using a locale with thousands_len==3.
2022-11-02 15:42:27 +00:00
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