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Fix BZ #17269 -- _IO_wstr_overflow integer overflow

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This commit is contained in:
Paul Pluzhnikov
2015-02-22 12:01:47 -08:00
parent 9529611240
commit bdf1ff052a
3 changed files with 16 additions and 4 deletions
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8
libio/wstrops.c
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@ -95,8 +95,11 @@ _IO_wstr_overflow (fp, c)
wchar_t *old_buf = fp->_wide_data->_IO_buf_base;
size_t old_wblen = _IO_wblen (fp);
_IO_size_t new_size = 2 * old_wblen + 100;
if (new_size < old_wblen)
if (__glibc_unlikely (new_size < old_wblen)
|| __glibc_unlikely (new_size > SIZE_MAX / sizeof (wchar_t)))
return EOF;
new_buf
= (wchar_t *) (*((_IO_strfile *) fp)->_s._allocate_buffer) (new_size
* sizeof (wchar_t));
@ -186,6 +189,9 @@ enlarge_userbuf (_IO_FILE *fp, _IO_off64_t offset, int reading)
return 1;
_IO_size_t newsize = offset + 100;
if (__glibc_unlikely (newsize > SIZE_MAX / sizeof (wchar_t)))
return 1;
wchar_t *oldbuf = wd->_IO_buf_base;
wchar_t *newbuf
= (wchar_t *) (*((_IO_strfile *) fp)->_s._allocate_buffer) (newsize