diff options
| -rw-r--r-- | fs/afs/internal.h | 2 | ||||
| -rw-r--r-- | fs/afs/main.c | 2 | ||||
| -rw-r--r-- | fs/afs/netdevices.c | 24 |
3 files changed, 21 insertions, 7 deletions
diff --git a/fs/afs/internal.h b/fs/afs/internal.h index 551db896afc9..d90c158cd934 100644 --- a/fs/afs/internal.h +++ b/fs/afs/internal.h @@ -563,7 +563,7 @@ extern void afs_fs_exit(void); * use-rtnetlink.c */ extern int afs_get_ipv4_interfaces(struct afs_interface *, size_t, bool); -extern int afs_get_MAC_address(u8 [6]); +extern int afs_get_MAC_address(u8 *, size_t); /* * vlclient.c diff --git a/fs/afs/main.c b/fs/afs/main.c index 40c2704e7557..80ec6fd19a73 100644 --- a/fs/afs/main.c +++ b/fs/afs/main.c @@ -54,7 +54,7 @@ static int __init afs_get_client_UUID(void) /* read the MAC address of one of the external interfaces and construct * a UUID from it */ - ret = afs_get_MAC_address(afs_uuid.node); + ret = afs_get_MAC_address(afs_uuid.node, sizeof(afs_uuid.node)); if (ret < 0) return ret; diff --git a/fs/afs/netdevices.c b/fs/afs/netdevices.c index 2b3087357fa9..ce08977858e0 100644 --- a/fs/afs/netdevices.c +++ b/fs/afs/netdevices.c @@ -10,21 +10,33 @@ #include <linux/if_arp.h> #include "internal.h" -int afs_get_MAC_address(u8 mac[ETH_ALEN]) +/* + * get a MAC address from a random ethernet interface that has a real one + * - the buffer will normally be 6 bytes in size + */ +int afs_get_MAC_address(u8 *mac, size_t maclen) { struct net_device *dev; int ret = -ENODEV; + if (maclen != ETH_ALEN) + BUG(); + rtnl_lock(); dev = __dev_getfirstbyhwtype(ARPHRD_ETHER); if (dev) { - memcpy(mac, dev->dev_addr, ETH_ALEN); + memcpy(mac, dev->dev_addr, maclen); ret = 0; } rtnl_unlock(); return ret; } +/* + * get a list of this system's interface IPv4 addresses, netmasks and MTUs + * - maxbufs must be at least 1 + * - returns the number of interface records in the buffer + */ int afs_get_ipv4_interfaces(struct afs_interface *bufs, size_t maxbufs, bool wantloopback) { @@ -32,6 +44,8 @@ int afs_get_ipv4_interfaces(struct afs_interface *bufs, size_t maxbufs, struct in_device *idev; int n = 0; + ASSERT(maxbufs > 0); + rtnl_lock(); for (dev = dev_base; dev; dev = dev->next) { if (dev->type == ARPHRD_LOOPBACK && !wantloopback) @@ -40,13 +54,13 @@ int afs_get_ipv4_interfaces(struct afs_interface *bufs, size_t maxbufs, if (!idev) continue; for_primary_ifa(idev) { - if (n == maxbufs) - goto out; bufs[n].address.s_addr = ifa->ifa_address; bufs[n].netmask.s_addr = ifa->ifa_mask; bufs[n].mtu = dev->mtu; n++; - } endfor_ifa(idev) + if (n >= maxbufs) + goto out; + } endfor_ifa(idev); } out: rtnl_unlock(); |