diff options
| -rw-r--r-- | src/macaddr.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/src/macaddr.c b/src/macaddr.c index afa7c936..de9d07af 100644 --- a/src/macaddr.c +++ b/src/macaddr.c @@ -113,6 +113,7 @@ int osmo_get_macaddr(uint8_t *mac_out, const char *dev_name) #include <net/if.h> #include <netinet/in.h> #include <netinet/ip.h> +#include <errno.h> /*! Obtain the MAC address of a given network device * \param[out] mac_out pointer to caller-allocated buffer of 6 bytes @@ -121,15 +122,19 @@ int osmo_get_macaddr(uint8_t *mac_out, const char *dev_name) */ int osmo_get_macaddr(uint8_t *mac_out, const char *dev_name) { - int fd, rc; + int fd, rc, dev_len; struct ifreq ifr; + dev_len = strlen(dev_name); + if (dev_len >= sizeof(ifr.ifr_name)) + return -EINVAL; + fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP); if (fd < 0) return fd; memset(&ifr, 0, sizeof(ifr)); - memcpy(&ifr.ifr_name, dev_name, sizeof(ifr.ifr_name)); + memcpy(&ifr.ifr_name, dev_name, dev_len + 1); rc = ioctl(fd, SIOCGIFHWADDR, &ifr); close(fd); |