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[Bug #20577] Fix freeing symbols when RUBY_FREE_AT_EXIT

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Dynamic symbols point to a fstring. When we free the symbol, we hash the
fstring to remove it from the table. However, the fstring could have
already been freed, which can cause a crash.

This commit changes it to remove the reference to the fstring before
freeing the symbol so we can avoid this crash.
This commit is contained in:
Peter Zhu 2024-06-12 15:07:53 -04:00
parent 94a8f05f00
commit 7c46aa5ed4
1 changed files with 11 additions and 0 deletions
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11
gc.c
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@ -4336,6 +4336,17 @@ rb_objspace_call_finalizer_i(VALUE obj, void *data)
case T_FILE: case T_FILE:
obj_free(objspace, obj); obj_free(objspace, obj);
break; break;
case T_SYMBOL:
if (rb_free_at_exit) {
if (RSYMBOL(obj)->fstr &&
(BUILTIN_TYPE(RSYMBOL(obj)->fstr) == T_NONE ||
BUILTIN_TYPE(RSYMBOL(obj)->fstr) == T_ZOMBIE)) {
RSYMBOL(obj)->fstr = 0;
}
obj_free(objspace, obj);
}
break;
case T_NONE: case T_NONE:
break; break;
default: default: