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Reject out-of-range numeric timezone specifications.

Browse Source 
In commit 631dc390f4, we started to handle
simple numeric timezone offsets via the zic library instead of the old
CTimeZone/HasCTZSet kluge.  However, we overlooked the fact that the zic
code will reject UTC offsets exceeding a week (which seems a bit arbitrary,
but not because it's too tight ...).  This led to possibly setting
session_timezone to NULL, which results in crashes in most timezone-related
operations as of 9.4, and crashes in a small number of places even before
that.  So check for NULL return from pg_tzset_offset() and report an
appropriate error message.  Per bug #11014 from Duncan Gillis.

Back-patch to all supported branches, like the previous patch.
(Unfortunately, as of today that no longer includes 8.4.)
This commit is contained in:
Tom Lane 2014-07-21 22:41:36 -04:00
parent 391aa8aac1
commit 6e5a39c9e6
2 changed files with 39 additions and 13 deletions
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49
src/backend/commands/variable.c
View File

@ -241,6 +241,8 @@ assign_timezone(const char *value, bool doit, GucSource source)
char *result;
char *endptr;
double hours;
int new_ctimezone;
pg_tz *new_tz;
/*
* Check for INTERVAL 'foo'
@ -294,16 +296,28 @@ assign_timezone(const char *value, bool doit, GucSource source)
pfree(interval);
return NULL;
}
/* Here we change from SQL to Unix sign convention */
#ifdef HAVE_INT64_TIMESTAMP
new_ctimezone = -(interval->time / USECS_PER_SEC);
#else
new_ctimezone = -interval->time;
#endif
new_tz = pg_tzset_offset(new_ctimezone);
if (!new_tz)
{
ereport(GUC_complaint_elevel(source),
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("invalid interval value for time zone: out of range")));
pfree(interval);
return NULL;
}
if (doit)
{
/* Here we change from SQL to Unix sign convention */
#ifdef HAVE_INT64_TIMESTAMP
CTimeZone = -(interval->time / USECS_PER_SEC);
#else
CTimeZone = -interval->time;
#endif
session_timezone = pg_tzset_offset(CTimeZone);
CTimeZone = new_ctimezone;
session_timezone = new_tz;
HasCTZSet = true;
}
pfree(interval);
@ -316,11 +330,22 @@ assign_timezone(const char *value, bool doit, GucSource source)
hours = strtod(value, &endptr);
if (endptr != value && *endptr == '\0')
{
/* Here we change from SQL to Unix sign convention */
new_ctimezone = -hours * SECS_PER_HOUR;
new_tz = pg_tzset_offset(new_ctimezone);
if (!new_tz)
{
ereport(GUC_complaint_elevel(source),
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("invalid value for time zone: out of range")));
return NULL;
}
if (doit)
{
/* Here we change from SQL to Unix sign convention */
CTimeZone = -hours * SECS_PER_HOUR;
session_timezone = pg_tzset_offset(CTimeZone);
CTimeZone = new_ctimezone;
session_timezone = new_tz;
HasCTZSet = true;
}
}
@ -352,8 +377,6 @@ assign_timezone(const char *value, bool doit, GucSource source)
/*
* Otherwise assume it is a timezone name, and try to load it.
*/
pg_tz *new_tz;
new_tz = pg_tzset(value);
if (!new_tz)

3
src/timezone/pgtz.c
View File

@ -1333,6 +1333,9 @@ pg_tzset(const char *name)
* The GMT offset is specified in seconds, positive values meaning west of
* Greenwich (ie, POSIX not ISO sign convention). However, we use ISO
* sign convention in the displayable abbreviation for the zone.
*
* Caution: this can fail (return NULL) if the specified offset is outside
* the range allowed by the zic library.
*/
pg_tz *
pg_tzset_offset(long gmtoffset)