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Fix OSS-Fuzz #416302790 (#18537)

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The parser accepted invalid code: consts are only valid at the top
level, but because GH-16952 changed the grammar it was incorrectly
allowed at all places that allowed attributed statements.
Fix this by introducing a variant of attributed_statement for the top
level.
This commit is contained in:
Niels Dossche 2025-05-12 18:45:01 +02:00 • committed by GitHub
parent 5e65d8e126
commit ba4567a987
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2 changed files with 17 additions and 3 deletions
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10
Zend/tests/constants/oss_fuzz_416302790.phpt Normal file
View file

@ -0,0 +1,10 @@
--TEST--
OSS-Fuzz #416302790
--FILE--
<?php
function x(){
#[Attr] const X = 1;
}
?>
--EXPECTF--
Parse error: syntax error, unexpected token "const" in %s on line %d

10
Zend/zend_language_parser.y
View file

@ -279,7 +279,7 @@ static YYSIZE_T zend_yytnamerr(char*, const char*);
%type <ast> isset_variable type return_type type_expr type_without_static
%type <ast> identifier type_expr_without_static union_type_without_static_element union_type_without_static intersection_type_without_static
%type <ast> inline_function union_type_element union_type intersection_type
%type <ast> attributed_statement attributed_class_statement attributed_parameter
%type <ast> attributed_statement attributed_top_statement attributed_class_statement attributed_parameter
%type <ast> attribute_decl attribute attributes attribute_group namespace_declaration_name
%type <ast> match match_arm_list non_empty_match_arm_list match_arm match_arm_cond_list
%type <ast> enum_declaration_statement enum_backing_type enum_case enum_case_expr
@ -391,13 +391,17 @@ attributed_statement:
| trait_declaration_statement { $$ = $1; }
| interface_declaration_statement { $$ = $1; }
| enum_declaration_statement { $$ = $1; }
;
attributed_top_statement:
attributed_statement { $$ = $1; }
| T_CONST const_list ';' { $$ = $2; }
;
top_statement:
statement { $$ = $1; }
| attributed_statement { $$ = $1; }
| attributes attributed_statement { $$ = zend_ast_with_attributes($2, $1); }
| attributed_top_statement { $$ = $1; }
| attributes attributed_top_statement { $$ = zend_ast_with_attributes($2, $1); }
| T_HALT_COMPILER '(' ')' ';'
{ $$ = zend_ast_create(ZEND_AST_HALT_COMPILER,
zend_ast_create_zval_from_long(zend_get_scanned_file_offset()));