Thanks for the quick response. james@xxxxxxxxxxx said: > Would you be able to open an issue for this? SIGSEGV from EVP_MAC_CTX_get_mac_size() #22842 https://github.com/openssl/openssl/issues/22842 > It is unusual to call EVP_MAC_CTX_get_mac_size() without first calling > EVP_MAC_init(), but the code should handle that (and return 0, as per the > documentation). The context is setting up a shared key for NTP. I'm trying to do some sanity checking when reading the keys file -- long before they get used. -------- >From your previous message: > Note that EVP_MAC_CTX_get_mac_size() does not seem to be called in the > back-trace you listed. Here is the code from crypto/evp/mac_lib.c size_t EVP_MAC_CTX_get_mac_size(EVP_MAC_CTX *ctx) { return get_size_t_ctx_param(ctx, OSSL_MAC_PARAM_SIZE); } I'm not a compiler wizard. I think that pattern is a special case. It's returning the result of a procedure call so it can throw away the current frame, setup the return address and jump to the target routine which will return directly to the caller. That saves a stack frame which can be a huge win with retursive code. It probably saves a few cycles and helps the working set. -- These are my opinions. I hate spam.
