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cutils: tighten qemu_parse_fd()

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qemu_parse_fd() used to handle at least the following strings incorrectly:
o "-2":         simply let through
o "2147483648": returned as LONG_MAX==INT_MAX on ILP32 (with ERANGE
                ignored); implementation-defined behavior on LP64

Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
This commit is contained in:
Laszlo Ersek 2014-04-10 10:24:30 +02:00 committed by Luiz Capitulino
parent cb45de6798
commit e9c5c1f40c
1 changed files with 10 additions and 3 deletions
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13
util/cutils.c
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@ -24,6 +24,8 @@
#include "qemu-common.h"
#include "qemu/host-utils.h"
#include <math.h>
#include <limits.h>
#include <errno.h>
#include "qemu/sockets.h"
#include "qemu/iov.h"
@ -457,11 +459,16 @@ int parse_uint_full(const char *s, unsigned long long *value, int base)
int qemu_parse_fd(const char *param)
{
int fd;
char *endptr = NULL;
long fd;
char *endptr;
errno = 0;
fd = strtol(param, &endptr, 10);
if (*endptr || (fd == 0 && param == endptr)) {
if (param == endptr /* no conversion performed */ ||
errno != 0 /* not representable as long; possibly others */ ||
*endptr != '\0' /* final string not empty */ ||
fd < 0 /* invalid as file descriptor */ ||
fd > INT_MAX /* not representable as int */) {
return -1;
}
return fd;