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lua: apply patch for "read overflow in 'l_strcmp'"

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<https://lua.org/bugs.html#5.4.6-1> (minimal port of changes)
This commit is contained in:
sfan5 2024-06-24 17:46:26 +02:00
parent 77ac20a66b
commit 837aab0e98
1 changed files with 9 additions and 8 deletions
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17
lib/lua/src/lvm.c
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@ -209,14 +209,15 @@ static int l_strcmp (const TString *ls, const TString *rs) {
int temp = strcoll(l, r);
if (temp != 0) return temp;
else { /* strings are equal up to a `\0' */
size_t len = strlen(l); /* index of first `\0' in both strings */
if (len == lr) /* r is finished? */
return (len == ll) ? 0 : 1;
else if (len == ll) /* l is finished? */
return -1; /* l is smaller than r (because r is not finished) */
/* both strings longer than `len'; go on comparing (after the `\0') */
len++;
l += len; ll -= len; r += len; lr -= len;
size_t zl1 = strlen(l); /* index of first '\0' in 'l' */
size_t zl2 = strlen(r); /* index of first '\0' in 'r' */
if (zl2 == lr) /* 'r' is finished? */
return (zl1 == ll) ? 0 : 1; /* check 'l' */
else if (zl1 == ll) /* 'l' is finished? */
return -1; /* 'l' is less than 'r' ('r' is not finished) */
/* both strings longer than 'zl'; go on comparing after the '\0' */
zl1++; zl2++;
l += zl1; ll -= zl1; r += zl2; lr -= zl2;
}
}
}