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validate utf-16 surrogate halves in decodeUnicodeCodePoint #1698

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validate utf-16 surrogate halves in decodeUnicodeCodePoint #1698

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16 changes: 16 additions & 0 deletions src/lib_json/json_reader.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -678,13 +678,21 @@ bool Reader::decodeUnicodeCodePoint(Token& token, Location& current,
if (*(current++) == '\\' && *(current++) == 'u') {
unsigned int surrogatePair;
if (decodeUnicodeEscapeSequence(token, current, end, surrogatePair)) {
if (surrogatePair < 0xDC00 || surrogatePair > 0xDFFF)
return addError("expecting a low surrogate (DC00-DFFF) to complete "
"the unicode surrogate pair",
token, current);
unicode = 0x10000 + ((unicode & 0x3FF) << 10) + (surrogatePair & 0x3FF);
} else
return false;
} else
return addError("expecting another \\u token to begin the second half of "
"a unicode surrogate pair",
token, current);
} else if (unicode >= 0xDC00 && unicode <= 0xDFFF) {
return addError("unexpected low surrogate (DC00-DFFF); a high surrogate "
"(D800-DBFF) must come first",
token, current);
}
return true;
}
Expand Down Expand Up @@ -1759,13 +1767,21 @@ bool OurReader::decodeUnicodeCodePoint(Token& token, Location& current,
if (*(current++) == '\\' && *(current++) == 'u') {
unsigned int surrogatePair;
if (decodeUnicodeEscapeSequence(token, current, end, surrogatePair)) {
if (surrogatePair < 0xDC00 || surrogatePair > 0xDFFF)
return addError("expecting a low surrogate (DC00-DFFF) to complete "
"the unicode surrogate pair",
token, current);
unicode = 0x10000 + ((unicode & 0x3FF) << 10) + (surrogatePair & 0x3FF);
} else
return false;
} else
return addError("expecting another \\u token to begin the second half of "
"a unicode surrogate pair",
token, current);
} else if (unicode >= 0xDC00 && unicode <= 0xDFFF) {
return addError("unexpected low surrogate (DC00-DFFF); a high surrogate "
"(D800-DBFF) must come first",
token, current);
}
return true;
}
Expand Down
18 changes: 18 additions & 0 deletions src/test_lib_json/main.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -3322,6 +3322,24 @@ JSONTEST_FIXTURE_LOCAL(CharReaderTest, parseString) {
"second half of a unicode surrogate pair\n"
"See Line 1, Column 12 for detail.\n");
}
{
char const doc[] = R"([ "\uD801\u0041" ])";
bool ok = reader->parse(doc, doc + std::strlen(doc), &root, &errs);
JSONTEST_ASSERT(!ok);
JSONTEST_ASSERT(errs == "* Line 1, Column 3\n"
" expecting a low surrogate (DC00-DFFF) to "
"complete the unicode surrogate pair\n"
"See Line 1, Column 16 for detail.\n");
}
{
char const doc[] = R"([ "\uDC00" ])";
bool ok = reader->parse(doc, doc + std::strlen(doc), &root, &errs);
JSONTEST_ASSERT(!ok);
JSONTEST_ASSERT(errs == "* Line 1, Column 3\n"
" unexpected low surrogate (DC00-DFFF); a high "
"surrogate (D800-DBFF) must come first\n"
"See Line 1, Column 10 for detail.\n");
}
{
char const doc[] = R"([ "\ua3t@" ])";
bool ok = reader->parse(doc, doc + std::strlen(doc), &root, &errs);
Expand Down