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[Bug libc/3944] New: strptime() segfaults on certain date formats
- From: "pandisv at yahoo dot co dot uk" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sources dot redhat dot com
- Date: 30 Jan 2007 21:05:25 -0000
- Subject: [Bug libc/3944] New: strptime() segfaults on certain date formats
- Reply-to: sourceware-bugzilla at sourceware dot org
Hello,
this is a bug originally reported at https://bugs.launchpad.net/bugs/50563 . An
Ubuntu user reported the following:
"This segfaults on Ubuntu Dapper:
#define _XOPEN_SOURCE
#include <time.h>
int main() {
struct tm tm;
strptime("2004", "%Y", &tm); /* Segfault. */
return 0;
}
This does not:
#define _XOPEN_SOURCE
#include <time.h>
int main() {
struct tm tm;
strptime("2004-01-01", "%Y-%m-%d", &tm); /* OK. */
strptime("2004-01", "%Y-%m", &tm); /* OK. */
return 0;
}
Internally, strptime() sets up a "struct tm" when parsing the date string. If
both the month and day-of-month are not present, two fields in that struct are
left uninitialized, and the segfault occurs when the uninitialized values are
used in an array lookup in time/strptime_l.c:day_of_the_week().
I have a patch for this, but cannot be sure that it works, because I don't have
enough disk space or CPU time for a glibc build."
Unfortunately, we haven't been able to contact the user for a patch. At any
rate, it would be nice if this were fixed. Thanks!
--
Summary: strptime() segfaults on certain date formats
Product: glibc
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: libc
AssignedTo: drepper at redhat dot com
ReportedBy: pandisv at yahoo dot co dot uk
CC: glibc-bugs at sources dot redhat dot com
http://sourceware.org/bugzilla/show_bug.cgi?id=3944
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