Quick fix for MacroRuleDefinition use-after-free
#2676
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Macro expansion seems to destruct instances of MacroRulesDefinition in modules. This patch should prevent a use-after-free by cloning and then leaking MacroRulesDefinition instances. gcc/rust/ChangeLog: * ast/rust-macro.h (MacroRulesDefinition::clone_macro_rules_def): New. * util/rust-hir-map.cc (Mappings::insert_macro_invocation): Clone, and then leak, the MacroRulesDefinition. Signed-off-by: Owen Avery <[email protected]>
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Converting this to a draft for a bit, just to make sure I understand the issue |
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do you have a Rust example where this causes a use-after-free? ASAN will probably be helpful with this, if you'd like I can send in my configure line and |
Not yet, that's why I converted this to a draft :P |
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Macro expansion seems to destruct instances of MacroRulesDefinition in modules. This patch should prevent a use-after-free by cloning and then leaking MacroRulesDefinition instances.