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LibSQL: Report a syntax error for unsupported LIMIT clause syntax

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Rather than aborting when a LIMIT clause of the form 'LIMIT expr, expr'
is encountered, fail the parser with a syntax error. This will be nicer
for the user and fixes the following fuzzer bug:
https://crbug.com/oss-fuzz/34837
This commit is contained in:
Timothy Flynn 2021-06-02 21:23:40 -04:00 • committed by Andreas Kling
parent 0ff09d4f74
commit a870eac0eb
2 changed files with 3 additions and 2 deletions
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1
Tests/LibSQL/TestSqlStatementParser.cpp
View file

@ -547,6 +547,7 @@ TEST_CASE(select)
EXPECT(parse("SELECT * FROM table LIMIT 12").is_error()); EXPECT(parse("SELECT * FROM table LIMIT 12").is_error());
EXPECT(parse("SELECT * FROM table LIMIT 12 OFFSET;").is_error()); EXPECT(parse("SELECT * FROM table LIMIT 12 OFFSET;").is_error());
EXPECT(parse("SELECT * FROM table LIMIT 12 OFFSET 15").is_error()); EXPECT(parse("SELECT * FROM table LIMIT 12 OFFSET 15").is_error());
EXPECT(parse("SELECT * FROM table LIMIT 15, 16;").is_error());
struct Type { struct Type {
SQL::ResultType type; SQL::ResultType type;

4
Userland/Libraries/LibSQL/Parser.cpp
View file

@ -321,11 +321,11 @@ NonnullRefPtr<Select> Parser::parse_select_statement(RefPtr<CommonTableExpressio
RefPtr<Expression> offset_expression; RefPtr<Expression> offset_expression;
if (consume_if(TokenType::Offset)) { if (consume_if(TokenType::Offset)) {
offset_expression = parse_expression(); offset_expression = parse_expression();
} else { } else if (consume_if(TokenType::Comma)) {
// Note: The limit clause may instead be defined as "offset-expression, limit-expression", effectively reversing the // Note: The limit clause may instead be defined as "offset-expression, limit-expression", effectively reversing the
// order of the expressions. SQLite notes "this is counter-intuitive" and "to avoid confusion, programmers are strongly // order of the expressions. SQLite notes "this is counter-intuitive" and "to avoid confusion, programmers are strongly
// encouraged to ... avoid using a LIMIT clause with a comma-separated offset." // encouraged to ... avoid using a LIMIT clause with a comma-separated offset."
VERIFY(!consume_if(TokenType::Comma)); syntax_error("LIMIT clauses of the form 'LIMIT <expr>, <expr>' are not supported");
} }
limit_clause = create_ast_node<LimitClause>(move(limit_expression), move(offset_expression)); limit_clause = create_ast_node<LimitClause>(move(limit_expression), move(offset_expression));