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LibXML+Tests: Consume > in the character data ending ]]> and test it

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For example, with this input:
```xml
<C>]]>
```
After seeing `<C>`, the parser will start parsing the content of the
element. The content parser will then parse any character data it sees.

The character parser would see the first two `]]` and consume them.
Then, it would see the `>` and set the state machine to say we have
seen this, but it did _not_ consume it and would instead tell
GenericLexer that it should stop consuming characters. Therefore,
we only consumed 2 characters.

Then, it would see that we are in the state where we've seen the
full `]]>` and try to take off three characters from the end of the
consumed input when we only have 2 characters, causing an assertion
failure as we are asking to take off more characters than there really
is.
This commit is contained in:
Luke Wilde 2022-05-29 22:25:43 +01:00 • committed by Linus Groh
parent 9a97ffe883
commit adb5f7e485
4 changed files with 32 additions and 2 deletions
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22
Tests/LibXML/TestParser.cpp Normal file
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/*
* Copyright (c) 2022, Luke Wilde <lukew@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibTest/TestCase.h>
#include <LibXML/Parser/Parser.h>
TEST_CASE(char_data_ending)
{
EXPECT_NO_CRASH("parsing character data ending by itself should not crash", [] {
// After seeing `<C>`, the parser will start parsing the content of the element. The content parser will then parse any character data it sees.
// The character parser would see the first two `]]` and consume them. Then, it would see the `>` and set the state machine to say we have seen this,
// but it did _not_ consume it and would instead tell GenericLexer that it should stop consuming characters. Therefore, we only consumed 2 characters.
// Then, it would see that we are in the state where we've seen the full `]]>` and try to take off three characters from the end of the consumed
// input when we only have 2 characters, causing an assertion failure as we are asking to take off more characters than there really is.
XML::Parser parser("<C>]]>");
(void)parser.parse();
return Test::Crash::Failure::DidNotCrash;
});
}