[gnutls-devel] GnuTLS | gnutls_int.h: make DECR_LEN neutral to signedness (!1056)

Development of GNU's TLS library gnutls-devel at lists.gnutls.org
Wed Sep 11 17:43:09 CEST 2019




Daiki Ueno commented on a discussion on lib/gnutls_int.h: https://gitlab.com/gnutls/gnutls/merge_requests/1056#note_215765092

>  
>  #define MEMSUB(x,y) ((ssize_t)((ptrdiff_t)x-(ptrdiff_t)y))
>  
> -#define DECR_LEN(len, x) do { len-=x; if (len<0) {gnutls_assert(); return GNUTLS_E_UNEXPECTED_PACKET_LENGTH;} } while (0)
> +#define DECR_LEN(len, x) do { if (len<x) {gnutls_assert(); return GNUTLS_E_UNEXPECTED_PACKET_LENGTH;} else len-=x; } while (0)

Ah, I see. Fixed now.

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