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Fix mbsnrtowcs() and wcsnrtombs() checks

This commit is contained in:
sin 2015-03-05 18:21:52 +00:00
parent c51977cfcc
commit 9b128ed538
1 changed files with 24 additions and 18 deletions
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42
include/wchar.h
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@ -23,16 +23,19 @@ __fortify_mbsnrtowcs(wchar_t *d, const char **s, size_t n,
size_t wn, mbstate_t *st)
{
size_t bos = __builtin_object_size(d, 0);
size_t actual;
size_t r;
if (wn > (size_t)-1 / sizeof(wchar_t))
__builtin_trap();
actual = wn * sizeof(wchar_t);
if (actual > n)
actual = n;
if (actual > bos)
__builtin_trap();
return mbsnrtowcs(d, s, n, wn, st);
if (wn > n / sizeof(wchar_t)) {
bos /= sizeof(wchar_t);
r = mbsnrtowcs(d, s, n, wn > bos ? bos : wn, st);
if (bos < wn && d && *s && r != (size_t)-1)
__builtin_trap();
} else {
r = mbsnrtowcs(d, s, n > bos ? bos : n, wn, st);
if (bos < n && d && *s && r != (size_t)-1)
__builtin_trap();
}
return r;
}
static inline __attribute__ ((always_inline))
@ -129,16 +132,19 @@ __fortify_wcsnrtombs(char *d, const wchar_t **s, size_t wn,
size_t n, mbstate_t *st)
{
size_t bos = __builtin_object_size(d, 0);
size_t actual;
size_t r;
if (wn > (size_t)-1 / sizeof(wchar_t))
__builtin_trap();
actual = wn * sizeof(wchar_t);
if (actual > n)
actual = n;
if (actual > bos)
__builtin_trap();
return wcsnrtombs(d, s, wn, n, st);
if (wn > n / sizeof(wchar_t)) {
bos /= sizeof(wchar_t);
r = wcsnrtombs(d, s, wn > bos ? bos : wn, n, st);
if (bos < wn && d && *s && r != (size_t)-1)
__builtin_trap();
} else {
r = wcsnrtombs(d, s, wn, n > bos ? bos : n, st);
if (bos < n && d && *s && r != (size_t)-1)
__builtin_trap();
}
return r;
}
static inline __attribute__ ((always_inline))