[gnutls-devel] GnuTLS | fix possible memory leakage (!1714)

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xuraoqing commented on a discussion on src/serv.c: https://gitlab.com/gnutls/gnutls/-/merge_requests/1714#note_1292203627

>  				return GNUTLS_E_DB_ERROR;
>  			}
>  			cache_db_alloc = cache_db_alloc * 2 + 1;
> -			cache_db = realloc(cache_db,
> -					   cache_db_alloc * sizeof(CACHE));
> -			if (!cache_db)
> +			ptr = realloc(cache_db,

I initially planned to use xrealloc as before, but cache_db may already have session data stored, and the user may need to do something else before aborting.

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