Fix BZ #17269 -- _IO_wstr_overflow integer overflow

diff --git a/ChangeLog b/ChangeLog
index 18961d8..9ae6b8b 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2015-02-22  Paul Pluzhnikov  <ppluzhnikov@google.com>
+
+       [BZ #17269]
+       * libio/wstrops.c (_IO_wstr_overflow): Guard against integer overflow
+       (enlarge_userbuf): Likewise.
+
 2015-02-22  Chung-Lin Tang  <cltang@codesourcery.com>
 
        * libio/tst-memstream2.c (TIMEOUT): Define as 100.

diff --git a/NEWS b/NEWS
index 5eb79d2..28ef45d 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -9,9 +9,9 @@ Version 2.22
 
 * The following bugs are resolved with this release:
 
-  4719, 13064, 14094, 15319, 15467, 15790, 16560, 17569, 17588, 17792,
-  17912, 17932, 17944, 17949, 17964, 17965, 17967, 17969, 17978, 17987,
-  17991, 17996, 17998, 17999.
+  4719, 13064, 14094, 15319, 15467, 15790, 16560, 17269, 17569, 17588,
+  17792, 17912, 17932, 17944, 17949, 17964, 17965, 17967, 17969, 17978,
+  17987, 17991, 17996, 17998, 17999.
 
 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
   new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red

diff --git a/libio/wstrops.c b/libio/wstrops.c
index 43d847d..3993579 100644 (file)
--- a/libio/wstrops.c
+++ b/libio/wstrops.c
@@ -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