proxy: Avoid invalid memory access when unloading proxy module #180
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When loading and unloading p11-kit-proxy.so with pkcs11-tool, it accesses already free'd memory area: $ valgrind pkcs11-tool --module p11-kit-proxy.so -L ==25173== Invalid read of size 8 ==25173== at 0x64BF493: p11_proxy_module_cleanup (proxy.c:1724) ==25173== by 0x64BD028: _p11_kit_fini (proxy-init.c:65) ==25173== by 0x401477C: _dl_close_worker (in /usr/lib64/ld-2.27.so) ==25173== by 0x4014E1D: _dl_close (in /usr/lib64/ld-2.27.so) ==25173== by 0x5E08C4E: _dl_catch_exception (in /usr/lib64/libc-2.27.so) ==25173== by 0x5E08CDE: _dl_catch_error (in /usr/lib64/libc-2.27.so) ==25173== by 0x58B1724: _dlerror_run (in /usr/lib64/libdl-2.27.so) ==25173== by 0x58B1113: dlclose (in /usr/lib64/libdl-2.27.so) ==25173== by 0x11E5A7: ??? (in /usr/bin/pkcs11-tool) ==25173== by 0x110023: ??? (in /usr/bin/pkcs11-tool) ==25173== by 0x5CF624A: (below main) (in /usr/lib64/libc-2.27.so) ==25173== Address 0x61231c8 is 552 bytes inside a block of size 584 free'd ==25173== at 0x4C2FDAC: free (vg_replace_malloc.c:530) ==25173== by 0x6548492: p11_virtual_unwrap (virtual.c:2902) ==25173== by 0x64BF492: p11_proxy_module_cleanup (proxy.c:1723)
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When loading and unloading p11-kit-proxy.so with pkcs11-tool, it
accesses already free'd memory area: