When using the cryptochip ATECC608B, from Microchip, with the provided cryptolibrary "cryptoauthlib", the pkcs11 related operations fail due to "xmalloc: zero size".

Steps to reproduce:
1.- Compile and install Microchip cryptoauthlib library.
2.- Modify this library to handle unset Mutexes (in functions pkcs11_lock_context and pkcs11_unlock_context change rv = CKR_CANT_LOCK for rv = CKR_OK)
3.- execute command ssh-keygen -D /usr/lib/libcryptoauth.so

Actual result:
xmalloc: zero size

Expected output:
C_GetAttributeValue failed: 7
failed to fetch key
ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBPmKkZ2M7DeVdwOpCW8XSnLYUbPx5RIk8OF8B0F0OwmRWexpsZONwft41YRI76gxZ/cN7wt4wO765ULvXQhxFCQ= device


This issue was solved by protecting the allocation of "k11->keyid" in line 614 of file "ssh-pkcs11.c", for example like:

++ if(k11->keyid_len)
++ {
	k11->keyid = xmalloc(k11->keyid_len);
	memcpy(k11->keyid, keyid_attrib->pValue, k11->keyid_len);
++ }

Would it be possible to include this fix or something similar to solve the problem?

Thank you very much!