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Merge pull request #1593 from agent-kilo/thread-message-size-check

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Try to fix cfun registry size check for cross-thread messages
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Calvin Rose 2025-05-08 17:00:22 -05:00 committed by GitHub
commit 523639362c
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1 changed files with 2 additions and 1 deletions
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src/core/ev.c
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@ -3015,7 +3015,8 @@ static JanetEVGenericMessage janet_go_thread_subr(JanetEVGenericMessage args) {
uint32_t count1; uint32_t count1;
memcpy(&count1, nextbytes, sizeof(count1)); memcpy(&count1, nextbytes, sizeof(count1));
size_t count = (size_t) count1; size_t count = (size_t) count1;
if (count > (endbytes - nextbytes) * sizeof(JanetCFunRegistry)) { /* Use division to avoid overflowing size_t */
if (count > (endbytes - nextbytes - sizeof(count1)) / sizeof(JanetCFunRegistry)) {
janet_panic("thread message invalid"); janet_panic("thread message invalid");
} }
janet_vm.registry_count = count; janet_vm.registry_count = count;