misc/134320: strtol: overflow error when it shouldn't be

Yuri yuri at tsoft.com
Wed May 6 23:30:05 UTC 2009

>Number:         134320
>Category:       misc
>Synopsis:       strtol: overflow error when it shouldn't be
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed May 06 23:30:04 UTC 2009
>Originator:     Yuri
>Release:        7.2-PRERELEASE
I look at the testcase:
#include <stdlib.h>
#include <limits.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>

main() {
  const char *nptr = "d223d221";
  long l = ::strtol(nptr, NULL, 16);
  printf("l=%x errno=%i err=%s\n", l, errno, strerror(errno));

It prints: l=7fffffff errno=34 err=Result too large

Why result is too large? 0xd223d221 is a valid representation of a signed 32-bit integer between LONG_MIN=-2,147,483,648(0x80000000) and LONG_MAX=+2,147,483,647(0x7fffffff).

So strtol could convert the value but didn't.




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