diff options
| -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; |