diff options
Diffstat (limited to 'mpi')
| -rw-r--r-- | mpi/mpi-types.h | 3 | ||||
| -rw-r--r-- | mpi/mpi.c | 9 | ||||
| -rw-r--r-- | mpi/mpi.h | 3 |
3 files changed, 13 insertions, 2 deletions
diff --git a/mpi/mpi-types.h b/mpi/mpi-types.h index 5d9f21d9..a55174fb 100644 --- a/mpi/mpi-types.h +++ b/mpi/mpi-types.h @@ -54,4 +54,7 @@ typedef int mp_err; #define MP_WORD_BIT convert(mp_size, CHAR_BIT*sizeof(mp_word)) #define MP_WORD_MAX convert(mp_word, -1) +#define MP_MAX_BITS (MP_SIZE_MAX - 1) +#define MP_MAX_DIGITS (MP_MAX_BITS / MP_DIGIT_BIT) + #define RADIX (convert(mp_word, MP_DIGIT_MAX) + 1) @@ -85,7 +85,8 @@ static const char *mp_err_string[] = { "out of memory", /* MP_MEM */ "argument out of range", /* MP_RANGE */ "invalid input parameter", /* MP_BADARG */ - "result is undefined" /* MP_UNDEF */ + "result is undefined", /* MP_UNDEF */ + "result is too large" /* MP_TOOBIG */ }; static const char *s_dmap_1 = @@ -209,6 +210,9 @@ mp_err mp_init_size(mp_int *mp, mp_size prec) { ARGCHK(mp != NULL, MP_BADARG); + if (prec > MP_MAX_DIGITS) + return MP_TOOBIG; + if ((DIGITS(mp) = coerce(mp_digit *, s_mp_alloc(prec, sizeof (mp_digit)))) == NULL) return MP_MEM; @@ -2663,6 +2667,9 @@ const char *mp_strerror(mp_err ec) /* Make sure there are at least 'min' digits allocated to mp */ mp_err s_mp_grow(mp_int *mp, mp_size min) { + if (min > MP_MAX_DIGITS) + return MP_TOOBIG; + if (min > ALLOC(mp)) { mp_digit *tmp; @@ -27,7 +27,8 @@ #define MP_RANGE -3 /* argument out of range */ #define MP_BADARG -4 /* invalid parameter */ #define MP_UNDEF -5 /* answer is undefined */ -#define MP_LAST_CODE MP_UNDEF +#define MP_TOOBIG -6 /* number is too large */ +#define MP_LAST_CODE MP_TOOBIG #define MP_LT -1 #define MP_EQ 0 |