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parse_time_interval: Allow negative time in settings

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This splits sign parsing out of parse_time_interval_uint() so that the
negative sign is applied outside of the unsigned context where the
number parsing is done, and after all the checks that it's lower than
(1 << 31)

This fixes issues with settings like `server_reconnect_time`,
`server_connect_timeout` and `lag_max_before_disconnect`, which accepted
-1 as a valid value.
This commit is contained in:
dequis 2017-06-17 14:30:37 -03:00
parent 9d3cfe1069
commit 7354a74c65
1 changed files with 25 additions and 13 deletions
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38
src/core/misc.c
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@ -781,24 +781,35 @@ int parse_uint(const char *nptr, char **endptr, int base, guint *number)
return TRUE;
}
static int parse_number_sign(const char *input, char **endptr, int *sign)
{
int sign_ = 1;
while (i_isspace(*input))
input++;
if (*input == '-') {
sign_ = -sign_;
input++;
}
*sign = sign_;
*endptr = (char *) input;
return TRUE;
}
static int parse_time_interval_uint(const char *time, guint *msecs)
{
const char *desc;
guint number;
int sign, len, ret, digits;
int len, ret, digits;
*msecs = 0;
/* max. return value is around 24 days */
number = 0; sign = 1; ret = TRUE; digits = FALSE;
number = 0; ret = TRUE; digits = FALSE;
while (i_isspace(*time))
time++;
if (*time == '-') {
sign = -sign;
time++;
while (i_isspace(*time))
time++;
}
for (;;) {
if (i_isdigit(*time)) {
char *endptr;
@ -828,7 +839,6 @@ static int parse_time_interval_uint(const char *time, guint *msecs)
if (*time != '\0')
return FALSE;
*msecs += number * 1000; /* assume seconds */
*msecs *= sign;
return TRUE;
}
@ -866,7 +876,6 @@ static int parse_time_interval_uint(const char *time, guint *msecs)
digits = FALSE;
}
*msecs *= sign;
return ret;
}
@ -960,15 +969,18 @@ int parse_size(const char *size, int *bytes)
int parse_time_interval(const char *time, int *msecs)
{
guint msecs_;
int ret;
char *number;
int ret, sign;
ret = parse_time_interval_uint(time, &msecs_);
parse_number_sign(time, &number, &sign);
ret = parse_time_interval_uint(number, &msecs_);
if (msecs_ > (1U << 31)) {
return FALSE;
}
*msecs = msecs_;
*msecs = msecs_ * sign;
return ret;
}