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author | pfg <pfg@FreeBSD.org> | 2014-04-29 15:25:57 +0000 |
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committer | pfg <pfg@FreeBSD.org> | 2014-04-29 15:25:57 +0000 |
commit | aa4f79bd1b9d9dce8f27070ef595729529a56807 (patch) | |
tree | 29bd5b654014f9c70803905b3009adcb132d7578 /lib | |
parent | c95e6bbc4fc811dece236808ec0f0cc9c15254bb (diff) | |
download | FreeBSD-src-aa4f79bd1b9d9dce8f27070ef595729529a56807.zip FreeBSD-src-aa4f79bd1b9d9dce8f27070ef595729529a56807.tar.gz |
citrus: Avoid invalid code points.
From the OpenBSD log:
The UTF-8 decoder should not accept byte sequences which decode to unicode
code positions U+D800 to U+DFFF (UTF-16 surrogates), U+FFFE, and U+FFFF.
http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
http://unicode.org/faq/utf_bom.html#utf8-4
Reported by: Stefan Sperling
Obtained from: OpenBSD
MFC after: 5 days
Diffstat (limited to 'lib')
-rw-r--r-- | lib/libc/locale/utf8.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/lib/libc/locale/utf8.c b/lib/libc/locale/utf8.c index 40f0e17..ef5784a 100644 --- a/lib/libc/locale/utf8.c +++ b/lib/libc/locale/utf8.c @@ -203,6 +203,14 @@ _UTF8_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n, errno = EILSEQ; return ((size_t)-1); } + if ((wch >= 0xd800 && wch <= 0xdfff) || + wch == 0xfffe || wch == 0xffff) { + /* + * Malformed input; invalid code points. + */ + errno = EILSEQ; + return ((size_t)-1); + } if (pwc != NULL) *pwc = wch; us->want = 0; |