diff options
| author | Laszlo Ersek <lersek@redhat.com> | 2014-04-10 10:24:30 +0200 |
|---|---|---|
| committer | Luiz Capitulino <lcapitulino@redhat.com> | 2014-05-08 14:19:58 -0400 |
| commit | e9c5c1f40c949c5d2d7e1eeddf3caaed32e1c641 (patch) | |
| tree | 2f81ee84959156d40e2d9ba80066aafa08520532 /util | |
| parent | cb45de6798956975c4b13a6233f7a00d2239b61a (diff) | |
cutils: tighten qemu_parse_fd()
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>
Diffstat (limited to 'util')
| -rw-r--r-- | util/cutils.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/util/cutils.c b/util/cutils.c index b337293239..dbe7412bd8 100644 --- a/util/cutils.c +++ b/util/cutils.c @@ -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; |