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commit bdf1ff052a8e23d637f2c838fa5642d78fcedc33
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Author: Paul Pluzhnikov <ppluzhnikov@google.com>
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Date: Sun Feb 22 12:01:47 2015 -0800
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Fix BZ #17269 -- _IO_wstr_overflow integer overflow
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diff --git a/libio/wstrops.c b/libio/wstrops.c
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index 43d847d..3993579 100644
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--- a/libio/wstrops.c
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+++ b/libio/wstrops.c
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@@ -95,8 +95,11 @@ _IO_wstr_overflow (fp, c)
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wchar_t *old_buf = fp->_wide_data->_IO_buf_base;
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size_t old_wblen = _IO_wblen (fp);
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_IO_size_t new_size = 2 * old_wblen + 100;
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- if (new_size < old_wblen)
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+
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+ if (__glibc_unlikely (new_size < old_wblen)
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+ || __glibc_unlikely (new_size > SIZE_MAX / sizeof (wchar_t)))
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return EOF;
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+
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new_buf
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= (wchar_t *) (*((_IO_strfile *) fp)->_s._allocate_buffer) (new_size
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* sizeof (wchar_t));
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@@ -186,6 +189,9 @@ enlarge_userbuf (_IO_FILE *fp, _IO_off64_t offset, int reading)
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return 1;
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_IO_size_t newsize = offset + 100;
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+ if (__glibc_unlikely (newsize > SIZE_MAX / sizeof (wchar_t)))
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+ return 1;
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+
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wchar_t *oldbuf = wd->_IO_buf_base;
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wchar_t *newbuf
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= (wchar_t *) (*((_IO_strfile *) fp)->_s._allocate_buffer) (newsize
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