[gnutls-devel] GnuTLS | Fix gnutls_pkcs11_token_get_info for short output buffers and fix a memleak (!827)
Development of GNU's TLS library
gnutls-devel at lists.gnutls.org
Thu Dec 13 15:01:23 CET 2018
Peter Wu commented on a discussion on lib/pkcs11.c:
> goto cleanup;
> }
>
> - snprintf(output, *output_size, "%s", tn.modname);
> - *output_size = strlen(output);
> - ret = 0;
> - goto cleanup;
> + modname = tn.modname;
> + if (modname == NULL) {
> + gnutls_assert();
Are you concerned about applications passing an uninitialized buffer and then trying to read uninitialized memory or the fact that the return value changed?
Previously `(null)` would be printed (or the application crashes depending on the C library), so I would argue that returning an error is also an appropriate action.
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