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Make sure we don't go past the end of the string when out of range.

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This commit is contained in:
Todd C. Miller 2019-10-16 10:08:33 -06:00
parent e339d9950d
commit 1037b685eb
1 changed files with 10 additions and 10 deletions
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20
lib/util/strtonum.c
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@ -109,12 +109,16 @@ sudo_strtonumx(const char *str, long long minval, long long maxval, char **endp,
break;
ch -= '0';
if (result < lastval || (result == lastval && ch > remainder)) {
/* Skip remaining digits. */
do {
ch = *cp++;
} while (isdigit(ch));
errval = STN_TOOSMALL;
break;
} else {
errval = STN_VALID;
result *= 10;
result -= ch;
errval = STN_VALID;
}
}
if (result > maxval)
@ -127,12 +131,16 @@ sudo_strtonumx(const char *str, long long minval, long long maxval, char **endp,
break;
ch -= '0';
if (result > lastval || (result == lastval && ch > remainder)) {
/* Skip remaining digits. */
do {
ch = *cp++;
} while (isdigit(ch));
errval = STN_TOOBIG;
break;
} else {
errval = STN_VALID;
result *= 10;
result += ch;
errval = STN_VALID;
}
}
if (result < minval)
@ -153,20 +161,12 @@ done:
*errstrp = N_("invalid value");
break;
case STN_TOOSMALL:
/* Skip remaining digits. */
do {
ch = *cp++;
} while (isdigit(ch));
result = 0;
errno = ERANGE;
if (errstrp != NULL)
*errstrp = N_("value too small");
break;
case STN_TOOBIG:
/* Skip remaining digits. */
do {
ch = *cp++;
} while (isdigit(ch));
result = 0;
errno = ERANGE;
if (errstrp != NULL)