[gnutls-devel] GnuTLS | gnutls_buffer_append_data: avoid use-after-free in the callers (!1399)

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Daiki Ueno commented on a discussion on lib/ext/key_share.c: https://gitlab.com/gnutls/gnutls/-/merge_requests/1399#note_525430010

>  		}
>  
>  		/* copy actual length */
> -		_gnutls_write_uint16(extdata->length - cur_length, lengthp);
> +		_gnutls_write_uint16(extdata->length - length_pos - 2,

Yes, exactly.

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