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Unfortunately because of libressl we cannot use new_reserve and therefore need to check the return value of the push... |
If it fails, then the duplicated item is not freed. Solve it by making sure the push cannot fail by reserving the necessary stack size upfront. Example Valgrind trace: ``` 14,009 (384 direct, 13,625 indirect) bytes in 1 blocks are definitely lost in loss record 27,287 of 27,373 malloc (at /usr/libexec/valgrind/vgpreload_memcheck-amd64-linux.so) CRYPTO_zalloc (at /usr/lib/x86_64-linux-gnu/libcrypto.so.3) <unknown stack frame> ASN1_item_new (at /usr/lib/x86_64-linux-gnu/libcrypto.so.3) *ossl_x509_alloc (ossl_x509cert.c:97) <unknown stack frame> rb_class_new_instance_pass_kw (at /usr/lib/x86_64-linux-gnu/libruby-3.2.so.3.2.3) <unknown stack frame> <unknown stack frame> <unknown stack frame> <unknown stack frame> rb_vm_exec (at /usr/lib/x86_64-linux-gnu/libruby-3.2.so.3.2.3) <unknown stack frame> <unknown stack frame> rb_catch_obj (at /usr/lib/x86_64-linux-gnu/libruby-3.2.so.3.2.3) <unknown stack frame> <unknown stack frame> <unknown stack frame> rb_vm_exec (at /usr/lib/x86_64-linux-gnu/libruby-3.2.so.3.2.3) rb_yield (at /usr/lib/x86_64-linux-gnu/libruby-3.2.so.3.2.3) rb_ary_each (at /usr/lib/x86_64-linux-gnu/libruby-3.2.so.3.2.3) <unknown stack frame> <unknown stack frame> <unknown stack frame> rb_vm_exec (at /usr/lib/x86_64-linux-gnu/libruby-3.2.so.3.2.3) rb_yield (at /usr/lib/x86_64-linux-gnu/libruby-3.2.so.3.2.3) rb_ary_each (at /usr/lib/x86_64-linux-gnu/libruby-3.2.so.3.2.3) <unknown stack frame> <unknown stack frame> <unknown stack frame> rb_vm_exec (at /usr/lib/x86_64-linux-gnu/libruby-3.2.so.3.2.3) rb_yield (at /usr/lib/x86_64-linux-gnu/libruby-3.2.so.3.2.3) rb_ary_each (at /usr/lib/x86_64-linux-gnu/libruby-3.2.so.3.2.3) <unknown stack frame> <unknown stack frame> <unknown stack frame> rb_vm_exec (at /usr/lib/x86_64-linux-gnu/libruby-3.2.so.3.2.3) rb_yield (at /usr/lib/x86_64-linux-gnu/libruby-3.2.so.3.2.3) rb_ary_each (at /usr/lib/x86_64-linux-gnu/libruby-3.2.so.3.2.3) <unknown stack frame> <unknown stack frame> <unknown stack frame> rb_vm_exec (at /usr/lib/x86_64-linux-gnu/libruby-3.2.so.3.2.3) <unknown stack frame> <unknown stack frame> rb_catch_obj (at /usr/lib/x86_64-linux-gnu/libruby-3.2.so.3.2.3) <unknown stack frame> <unknown stack frame> <unknown stack frame> rb_vm_exec (at /usr/lib/x86_64-linux-gnu/libruby-3.2.so.3.2.3) ```
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I've squashed in the fixup commit. |
rhenium
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Feb 26, 2026
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Good catch! Thanks for spotting.
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If it fails, then the duplicated item is not freed. Solve it by making sure the push cannot fail by reserving the necessary stack size upfront.
Example Valgrind trace:
This was found by a hybrid static-dynamic analyser that looks for inconsistent handling of error checks in bindings.