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gvariant: Fix more bounds checking in GVariant text format parser

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token_stream_prepare() was over-reading at the start of bytestring
literals (`b'blah'`).

Add tests for that, and for some other situations regarding bytestring
literal parsing, in order to try and get full branch coverage of that
bit of code.

oss-fuzz#9805

Signed-off-by: Philip Withnall <withnall@endlessm.com>
This commit is contained in:
Philip Withnall 2018-08-10 10:28:06 +01:00
parent 0d271223d8
commit a9108f8bfd
2 changed files with 13 additions and 1 deletions
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3
glib/gvariant-parser.c
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@ -197,7 +197,8 @@ token_stream_prepare (TokenStream *stream)
break;
case 'b':
if (stream->stream[1] == '\'' || stream->stream[1] == '"')
if (stream->stream + 1 != stream->end &&
(stream->stream[1] == '\'' || stream->stream[1] == '"'))
{
for (end = stream->stream + 2; end != stream->end; end++)
if (*end == stream->stream[1] || *end == '\0' ||

11
glib/tests/gvariant.c
View File

@ -3892,6 +3892,17 @@ test_parse_failures (void)
"string 4", "7-8:", "can not parse as",
"\x0a", "1:", "expected value",
"((", "2:", "expected value",
"(b", "1:", "expected value",
"b'", "0-2:", "unterminated string constant",
"b\"", "0-2:", "unterminated string constant",
"b'a", "0-3:", "unterminated string constant",
"b\"a", "0-3:", "unterminated string constant",
"b'\\", "0-3:", "unterminated string constant",
"b\"\\", "0-3:", "unterminated string constant",
"b'\\'", "0-4:", "unterminated string constant",
"b\"\\\"", "0-4:", "unterminated string constant",
"b'\\'a", "0-5:", "unterminated string constant",
"b\"\\\"a", "0-5:", "unterminated string constant",
};
gint i;