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grammar-parser : fix possible null-deref (#9004)

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Fixes: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=70680

Signed-off-by: David Korczynski <david@adalogics.com>
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DavidKorczynski 2024-08-12 13:36:41 +01:00 committed by GitHub
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common/grammar-parser.cpp
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@ -369,6 +369,9 @@ namespace grammar_parser {
}
// Validate the state to ensure that all rules are defined
for (const auto & rule : state.rules) {
if (rule.empty()) {
throw std::runtime_error("Undefined rule");
}
for (const auto & elem : rule) {
if (elem.type == LLAMA_GRETYPE_RULE_REF) {
// Ensure that the rule at that location exists