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I checked a
new version 5.3.5 of Lua and found overflow bug in four
functions.
The older
versions of Lua also contain this error.
Affected
functions.
lauxlib.c
int
countlevels (lua_State *L)
ltable.c
int
unbound_search (Table *t, unsigned int j)
int
luaH_getn (Table *t);
ltabllib.c
void
auxsort (lua_State *L, TabA *ta, int l, int u)
The bug is
very common. This equation leads overflow.
m = (h + l) /
2;
The equation
should be rewritten as:
m = l + (h -
l) / 2;
https://stackoverflow.com/questions/6735259/calculating-mid-in-binary-search
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