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Free after insert in generic_ivar_set_shape_fields #13635

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merged 1 commit into from
Jun 17, 2025

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@jhawthorn jhawthorn commented Jun 17, 2025

Previously we were performing a realloc and then inserting the new value into the table. If the table was flagged as requiring a rebuild, this could trigger GC work and marking within that GC could access the fields freed by realloc.

VALUE *fields = xrealloc(old_fields, new_capa);
st_insert(geniv_tbl, obj, fields); // <-- GC can happen here, and that
                                   //   could attempt to mark old_fields,
                                   //   since that's still in the table

Previously we were performing a realloc and then inserting the new value
into the table. If the table was flagged as requiring a rebuild, this
could trigger GC work and marking within that GC could access the fields
freed by realloc.
@byroot byroot merged commit 055fef0 into ruby:master Jun 17, 2025
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